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Himalayan lakes are exacerbating glacial melt

Himalayan lakes are exacerbating glacial melt
Figure 1: A typical situation in the Himalaya: glaciers have largely retreated, and lakes now cover the area where the glacier tongue was in earlier times – Garlung Co lake in Central Himalaya. Photo taken by J Pronk in October this year during a joint expedition with Chinese colleagues from the Institute of Tibetan Plateau Research. Credit: University of St Andrews

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The rate glaciers are melting in the Himalaya is being significantly accelerated by lakes already formed by glacial retreat, new research led by the University of St Andrews has found.

The study, published in Scientific Reports, concluded that the  which have flowed into the lakes in recent decades are retreating and thinning at a much greater rate than any other glaciers in the Himalaya.

These glaciers are responsible for as much as 30 percent of the ice loss in different parts of the mountain range, despite comprising just 10 to 15 percent of the total glacier population.

The behavior of glaciers provides the clearest indication of climatic change in high mountain regions. Long-term atmospheric warming has caused the recession of glaciers across the Himalaya.

Meltwater from glaciers in this region sustains the flow of river systems on which hundreds of millions of people depend for their basic needs.

Not all the meltwater instantly drains to downstream catchments and thousands of  have developed and continue to expand high in the Himalaya. Until this study, the influence of glacial lakes on glacier behavior has not been thoroughly investigated in the Himalaya, despite the rapid increase in  area and number.

  • Himalayan lakes are exacerbating glacial melt
    Figure 3: Where lakes formed, glaciers retreated significantly: Lake Garlung Co, Central Himalaya. Credit: J Pronk
  • Himalayan lakes are exacerbating glacial melt
    Figure 2: A large lake formed where once a glacier was: Lake Garlung Co. Credit: T Bolch, University of St Andrews
  • Himalayan lakes are exacerbating glacial melt
    Figure 3: Where lakes formed, glaciers retreated significantly: Lake Garlung Co, Central Himalaya. Credit: J Pronk
  • Himalayan lakes are exacerbating glacial melt
    Figure 2: A large lake formed where once a glacier was: Lake Garlung Co. Credit: T Bolch, University of St Andrews

Now, scientists have used declassified US Hexagon spy satellite imagery, data from the Shuttle Radar Topographic Mission in 2000 and data from modern satellites to examine the relationship between glaciers and glacial lakes since the 1970s.

The results show that glacier mass loss has occurred since at least the 1970s and has accelerated since the millennium. Glaciers in contact with glacial lakes, showed significantly higher mass loss and terminus retreat rates and are therefore likely to be driving the accelerating mass loss from the region.

Dr. Owen King, of the School of Geography and Sustainable Development at the University of St Andrews, said: “Further enhanced mass loss is very likely should the increases in the total number and area of glacial lakes continue.”

  • Himalayan lakes are exacerbating glacial melt
    Figure 5: Significant retreat of a glacier and growth of its proglacial lake in Sikkim Himalaya: comparison of the situation years 1974 based on Hexagon KH-9 US spy satellite data and 2017 Pleiades satellite data. Credit: University of St Andrews
  • Himalayan lakes are exacerbating glacial melt
    Figure 4: Lake Jialong Co in Central Hiamalya. Credit: T Bolch, University of St Andrews
  • Himalayan lakes are exacerbating glacial melt
    Figure 5: Significant retreat of a glacier and growth of its proglacial lake in Sikkim Himalaya: comparison of the situation years 1974 based on Hexagon KH-9 US spy satellite data and 2017 Pleiades satellite data. Credit: University of St Andrews
  • Himalayan lakes are exacerbating glacial melt
    Figure 4: Lake Jialong Co in Central Hiamalya. Credit: T Bolch, University of St Andrews

Dr. Tobias Bolch, also of the School of Geography and Sustainable Development, added: “Our results have important implications for future projections of ice loss from the region, as the interaction of glaciers and glacial lakes has not previously been considered in future glacier  estimates.”

The paper, “Glacial lakes exacerbate Himalayan glacier ,” by Owen King, Atanu Bhattacharya and Tobias Bolch, is published in Scientific Reports.


Explore further

Disappearing Peruvian glaciers


More information: Owen King et al. Glacial lakes exacerbate Himalayan glacier mass loss, Scientific Reports (2019). DOI: 10.1038/s41598-019-53733-x

Journal information: Scientific Reports
Climate Change

Climate financing or debt traps?

M Zakir Hossain Khan, senior program manager (Climate Finance Governance) at Transparency International Bangladesh (TIB), speaks to Dhaka Tribune’s Mehedi Al Amin about climate financing ahead of the COP25. This is the final instalment in a three-part series.

What is climate finance and how is it progressing?

The Copenhagen Accord and the Paris Agreement defined climate finance should be “New” and “Additional” to Official Development Assistance from the developed countries to the vulnerable least developed countries (LDCs) or developing countries. Unfortunately, that pledge was not fulfilled by the developed countries. Of the total approved projects under global climate funds, LDCs have only 23% share of the total pledged amount.

The 10 most vulnerable countries including Bangladesh have received only $1.3 billion from the Global Climate Fund (GCF). However, altogether around $10.3 billion has been pledged to GCF, and around 10% of the fund is mobilized through United Nations Framework Convention on Climate Change (UNFCCC) channels including the GCF.

What is the present scenario of climate finance for vulnerable countries? Is the 50:50 ratio of climate finance for adaptation and mitigation guaranteed?

So far, rich countries have pledged an equivalent of $30.4 billion, but only $6.8 billion has been actually disbursed. From the GCF, around $2.8 billion have been approved against the demand for around $20 billion, where Bangladesh alone needs $2.5 billion per year. There is no clear direction on how projects will be granted or in what form they will be allocated. It was already decided that the ratio of mitigation and adaptation would be 50-50, but only 24% of funds have been allocated for adaptation.

Also Read – ‘Only 2% of global climate change funds reach most vulnerable people’‘

Bangladesh is one of the most vulnerable countries to climate change. What kind of role should the nation play at the COP25 to negotiate for adequate climate finance?

We are observing that usually the developed countries are pushing the loan in contrary to the need for the most vulnerable LDCs. You might know that from the allocation of the GCF around 41% of total funding was the loan. That is contradictory to the “Polluters-Pay-Principle” of the UNFCCC. LDCs including Bangladesh should raise their voices for more grant-based finance for adaptation. Transparency and accountability of the GCF decision-making authority also need to be discussed.

How can Bangladesh properly address the loss and damage due to climate change?

The Warsaw International Mechanism for Loss and damages was adopted in the Paris Agreement. But not a single fund so far has been allocated to the growing climate change-induced loss and damage. In reverse, several international financial institutions are trying to impose insurance which will be burdensome for the climate-vulnerable community. I believe that Bangladesh along with other LDCs should demand grant-based funds to address the loss and damage. At the same time, LDCs must generate proper scientific evidence to claim their dues.

Is climate change financing a political tool in providing finance to projects to the poor countries under the harsh condition of loans?

This is a very crucial point. If you see the top 10 most vulnerable countries of the world, seven of them are either developing or poor countries. Therefore, integrated funding should be mobilized for both climate adaptation as well as development purposes. If the developed countries try to push loans as climate finance for climate-vulnerable poor countries, they would be in the “Climate-Debt-Trap,” a concern we have been raising since 2017.

Also Read – ‘Allocation, and disbursement of climate funds must be simplified’

Bangladesh has recently invested heavily in coal-based power plants which are blamed for global warming, while negotiating for climate financing as a vulnerable country. How would you explain it?

The way Bangladesh has planned to set up coal-based power plants, they will be like “carbon bombs.” After the Paris Agreement, there is no room to establish a single coal-based power plant anywhere in the world.

Bangladesh has committed to generating 100% power from renewable energy. There is plenty of opportunity in both solar and also 22,000MW wind power. Most importantly, due to several coal-based power plants near the Sundarbans, the natural shield against any natural disaster will be endangered and ultimately adaptation costs will increase.

Coal plants will not only be economically burdensome, but also devastating for the environment. Bangladesh has created an example of responsibility to address climate change issues from its resources, they should maintain that.

Climate Change

IPCC’s special report on Oceans and Cryosphere in a changing climate : Key takeaways for Hindu-Kush Himalayan Region

Image result for hindukush

ANJAL PRAKASH

The Intergovernmental Panel on Climate Change (IPCC) has recently released a special report on the Ocean and Cryosphere[1] in a Changing Climate (SROCC). This report assessed the latest scientific knowledge about the physical science basis and impacts of climate change on ocean, coastal, polar and mountain ecosystems, and the human communities that depend on them. It also evaluated their vulnerabilities and adaptation capacity and determined that the ocean and cryosphere play a critical role in sustaining life. In particular, it shows that the ocean has taken up more than 90% of the heat generated by greenhouse gas emissions and is reducing warming on land. Ocean warming, together with ocean acidification (from carbon dioxide uptake), loss of oxygen, and changes in nutrient supplies is affecting the distribution and abundance of marine life in coastal areas, including in the open ocean and at the seafloor. Glaciers and ice sheets all around the world are losing mass at an increasing rate. Warmer ocean water causes several parts of the Antarctic ice sheet to lose mass.  At the same time, Greenland is losing mass due to increased surface melting. Melting ice sheets and glaciers now contribute more to the global mean sea level rise than the expansion of warming ocean waters. This shows that climate change is rapidly changing these two systems which has larger implications for humanity if remains unchecked. With this context in mind, in this piece, I will highlight the key takeaways for Hindu-Kush Himalayan Region.

Changing Cryosphere: What is in for Hindu Kush Himalayan (HKH) Region?

The term Hindu Kush Himalayan (HKH) region – which covers the high mountain chains of Central, South and Inner Asia that includes the Tien Shan, Kun Lun, Pamir, Hindu Kush, Karakoram, Himalayas, and Hengduan and the high-altitude Tibetan Plateau — has one of the world’s largest renewable supplies of freshwater. The Himalayan region has the largest reserve of water in the form of ice and snow outside the Polar Regions; this is why it is called the ‘third pole’. Based on the latest available government data sources and projections, in 2017, the population of the mountain and hills of the Hindu Kush Himalaya was about 240 million people. The total population in the ten major river basins with their headwaters in the HKH was about 1.9 billion, including the 240 million in the mountain and hills of the HKH. These big river systems, which originate in the HKH region, support irrigation in agricultural areas and provide drinking water to millions of rural and urban populations. These systems are major economic engines of the region, especially due to their large freshwater reserve, which makes it a natural resource support for the billions of people living downstream. Therefore, what happens to Himalayan glaciers has an impact on the two billion people living in Asia. It is clear that climate change is impacting the region with increased intensity, and further impacts will have severe ramifications for the economy, livelihood and ecosystem.

Below, I provide 6 important points which is reemphasised by SROCC and come from earlier findings coming from the recent researches in the region.

  1. Water gaps are increasing: A study by HI-AWARE shows that in the 21st century alone, water consumption in downstream areas of the Indus, Ganges, and Brahmaputra (IGB) basins is projected to increase by 24%, 42% and 107%, respectively. Water use for industrial and domestic purposes is projected to increase three to seven-fold. The increase in water availability will be stronger in the upstream parts which will increase the dependency of downstream water users on upstream water resources. For example, the current blue water gap, based on unsustainable groundwater withdrawals, is 83 km3/year in the Indus and 35 km3/ year in the Ganges, and will increase by 7% and 11% towards the end of the century. There are three areas in which this process of changing climate will impact the people downstream: the water gap will increase due to socio-economic development and population rise. Secondly, while the demand will reduce, flood events will increase, and finally, heat waves will continue to rise. All these will impact those already living below poverty line the most. #2 and #3 are detailed below:
  2. Flood events will increase: Floods will become more frequent and severe in the mountainous and downstream areas of the Indus, Ganges and Brahmaputra river basins, because of an increase in extreme precipitation events. Depending on the severity of climate change, flood events are expected to more than double towards the end of the century.
  3. Rising temperatures: HKH regions are extremely susceptible to temperature increase. Under a 1.5 °C global warming scenario, the areas are projected to warm up by more than 2 °C on average by the end of this century. At higher altitudes this warming will be even more marked, due to the elevation dependent warming. A 2 °C global warming scenario could lead to a warming of around 2.7 °C in glaciated river basins. Currently, more likely climate change scenarios — which are specific for these river basins — suggest regional temperature increases between 3.5 and 6 °C by 2100. Most of the projections also indicate overall wetter conditions in the future and increases in extreme precipitation events. This will lead to significant losses in glacier volume, from 36 to 64%, depending on the warming scenario, and impact timing of water flows and water availability. Therefore, the rate of risk is extremely high in the present emission scenario. Heat waves are expected to increase in intensity and duration in South Asia. Already, the heat thresholds in cities have exceeded previous limits. Individual solutions for keeping houses and neighbourhoods cool will not be enough: concerted efforts are needed at the urban landscape, community and individual levels to address the challenge of increasing urban heat in South Asia.
  4. People living far from oceans and glaciers are also impacted: It is sometimes forgotten that even people living far from the ocean or cryosphere depend on these systems. Snow and glacier melt from high mountains helps to sustain the rivers that deliver water resources to downstream populations. Due to global warming and its implications in the water resources in the HKH region, three sectors will be directly affected: water for domestic use, agriculture and hydroelectricity.
  5. Climate uncertainties will rise: Due to variability in rainfall patterns and glacier melt, there is a large-scale uncertainty in the system. For example, floods and droughts will be more frequent, and will have implications on people who are largely dependent on agriculture and water for domestic use including drinking. Recent information shows that the flood events have increased during last decade and if this scenario continues, it will have huge impacts on economy. For example, hydropower systems have to be tuned to these changes and future projects have to build climate resilient infrastructure.
  6. Women and poor people: One of the most striking impacts of climate change is on of women, as they are at the forefront of the economy, particularly in mountain areas. This is because men from the mountain regions are often migrants; this leaves women to manage household work and other tasks related to agriculture, natural resource management, community, and other public sphere related work—such as in markets or public institutions —that were traditionally men’s work. Land tenure and employment policies undervalue rural women’s critical roles in food security, sustainable agriculture, and natural resource management, despite women taking on the major role in these sectors. In most cases, women throughout the region do not have corresponding decision-making rights or control over resources despite shouldering both productive and reproductive workloads and responsibilities.

Possible Solutions

A combined strategy of adaptation with mitigation is key. It is unlikely that the process of climate change will be reversed, so it is best to focus on adaption. Serious policy changes and careful planning can create a climate-resilient infrastructure. The current lack of coordinated planning is currently, a major obstacle: for instance, the HKH region is trans-boundary in nature, with many watersheds are spread across different countries. Management of shared water at a trans-boundary level has its own challenges, especially when countries that fall in the watershed do not share relationships of trust. This process leads to inadequate water management at almost every level in the HKH region. At the national level, water management is marked by short-term approach, with seemingly little attention to long-term consequences. At the regional level, there is a huge scope for countries to come together — at least on river basin levels — to generate scientific knowledge in a coordinated fashion, and exercise joint policies for conservation of trans-boundary aquifer systems. This approach could benefit from system-based thinking which is lacking in the present approach. At the local level, building the community’s capacity to adapt and making infrastructure resilient is the key.


[1] Cryosphere is the frozen parts of our planet that includes ice and snow on land, continental ice sheets found in Greenland and Antarctica as well as ice caps, glaciers, snow and permafrost.

Climate Change

Tree rings can predict climate change

Reconstructions of past responses of vegetation from different ecosystems can predict the impact of climate change on weather and other environmental parameters, scientists said at the 6th Asian Dendrochronology Conference being held at the Birbal Sahni Institute of Palaeosciences in Lucknow. This is the first time that the conference is being held in India. The studies presented and deliberated at the conference were mostly from different ecological niches within Asia.

Dendrochronology is the study of tree rings that hold a wealth of information about not only a tree’s past but also that of the ecosystem in which it lives. Tree rings are layers of growth that a tree acquires in a year. The colour of old wood is always darker than a comparatively newer wood which creates a contrasting pattern of rings year on year. In the years of good growth, characterised by a healthy supply of resources, the ring is thick. It is thin when the ecosystem has dearth of resources. Trees can be great records for past and recent climates, much better than climate records as their density in a region is much greater than climate observatories and their information close enough to actual conditions.

Many of the presented papers showed a close relationship between temperature, precipitation and tree ring width. For instance, a paper on the tree growth rates in the Hengduan Mountains of South West China by Ze-Xin Fan from the Chinese Academy of Sciences (CAS), showed reduced coniferous tree ring growth under recent warming and drying climate, a phenomenon known as divergence. The paper further stated that tree growth in high latitudes and elevations is sensitive to temperatures in summer and winter season whereas tree growth in lower latitudes and elevations is sensitive to moisture in the spring season.

Another study, which brought out a 226-year long chronology of teak trees from southern Myanmar, showed that intense floods and droughts have periodically occurred in the region and their continuation or even intensification in a warming climate can lead to adverse effects on traditional agriculture and forest based economies. The authors also correlated the extreme events to large scale climate phenomenon like El Nino Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO) and sea surface temperatures of the Pacific and Indian Ocean.

Eryuan Liang, also from CAS, showed that competition among vegetation species that grow close to trees at the upper-most altitudes, often known as the treeline, could counteract the general upward movement of trees due to global warming. His research analysed the treeline position of 20 plots and found that the treelines had shifted by 0.56 m-1 m in the past 150 years. Another interesting study by Somaru Ram from Indian Institute of Tropical Meteorology, Pune, showed that increasing heat index and mean temperature during summers in Sikkim has had an adverse effect on tree growth due to high potential evapotranspiration—the rate at which plants loose water through their leaves. Such studies help scientists understand the impact of climate change at the local scale and a network of such chronologies can also help them understand climate change impacts across countries and continents. The researchers also called for the establishment of enhanced tree ring chronology networks for better cooperation.

Climate Change

Italy Makes Climate Change Mandatory Part of Curriculum in Schools

Italy will now make climate change a compulsory part of education, Education Minister Lorenzo Fioramonti announced on November 5th.

Starting next September, all state schools will require 33 hours each year to climate change. This amounts to one hour a week of instruction on sustainability and climate change. According to Fioramonti, Italy is the first country to make an education change like this.

Fioramonti told Reuters in an interview, “The entire ministry is being changed to make sustainability and climate the center of the education model. I want to make the Italian education system the first education system that puts the environment and society at the core of everything we learn in school.” He said that lessons in geography, math and physics would also be taught through the lens of sustainable development.

An outspoken climate change activist, Fioramonti received criticism for encouraging students to skip school to take part in the climate protests, according to Reuters. He said that “The 21st-century citizen must be a sustainable citizen.”

The climate change curriculum will be developed over the coming year and will include input from environmental experts. It will also vary by age group, high school will focus on the United Nations’ 2030 Sustainable Development Agenda, middle school will be learning technical information and elementary school will connect environmental stories to cultures.

In another move to help the planet, Italy said this month it would tax plastics and sugar starting in 2020.

Read more about climate change in schools, including New York City Schools Ban Processed Meats! and Tel Aviv Schools Ban Single Use Plastic for Meals.

The United Nation recently released a report warning countries about the dangers of climate change and has urged people to eat more plant-based as a way to curb it. We highly recommend downloading the Food Monster App on iTunes — with over 15,000 delicious recipes it is the largest meatless, plant-based, vegan and allergy-friendly recipe resource to help reduce your environmental footprint, save animals and get healthy! And, while you are at it, we encourage you to also learn about the environmental and health benefits of a plant-based diet.

Climate Change

Crops under shifting cultivation hit in Mizoram villages: Study

Climate Change

Ten facts about the economics of climate change and climate policy

REPORT

A joint report from The Hamilton Project and the Stanford Institute for Economic Policy Research

INTRODUCTION: SCIENTIFIC BACKGROUND

Substantial Biophysical Damages Will Occur in the Absence of Strong Climate Policy Action

The world’s climate has already changed measurably in response to accumulating greenhouse gas (GHG) emissions. These changes as well as projected future disruptions have prompted intense research into the nature of the problem and potential policy solutions. This document aims to summarize much of what is known about both, adopting an economic lens focused on how ambitious climate objectives can be achieved at the lowest possible cost.

Considerable uncertainties surround both the extent of future climate change and the extent of the biophysical impacts of such change. Notwithstanding the uncertainties, climate scientists have reached a strong consensus that in the absence of measures to reduce GHG emissions significantly, the changes in climate will be substantial, with long-lasting effects on many of Earth’s physical and biological systems. The central or median estimates of these impacts are significant. Moreover, there are significant risks associated with low probability but potentially catastrophic outcomes. Although a focus on median outcomes alone warrants efforts to reduce emissions of GHGs, economists argue that the uncertainties and associated risks justify more aggressive policy action than otherwise would be warranted (Weitzman 2009; 2012).

The scientific consensus is expressed through summary documents offered every several years by the United Nations–sponsored Intergovernmental Panel on Climate Change (IPCC). These documents indicate the projected outcomes under alternative representative concentration pathways (RCPs) for GHGs (IPCC 2014). Each of these RCPs represents different GHG trajectories over the next century, with higher numbers corresponding to more emissions (see box 1 for more on RCPs).


BOX 1. REPRESENTATIVE CONCENTRATION PATHWAYS (RCPS)

The expected path of GHG emissions is crucial to accurately forecasting the physical, biological, economic, and social effects of climate change. RCPs are scenarios, chosen by the IPCC, that represent scientific consensus on potential pathways for GHG emissions and concentrations, emissions of air pollutants, and land use through 2100. In their most-recent assessment, the IPCC selected four RCPs as the basis for its projections and analysis. We describe the RCPs and some of their assumptions below:

  • RCP 2.6: emissions peak in 2020 and then decline through 2100.
  • RCP 4.5: emissions peak between 2040 and 2050 and then decline through 2100.
  • RCP 6.0: emissions continue to rise until 2080 and then decline through 2100.
  • RCP 8.5: emissions rise continually through 2100.

The IPCC does not assign probabilities to these different emissions pathways.  What is clear is that the pathways would require different changes in technology and policy. RCPs 2.6 and 4.5 would very likely require significant advances in technology and changes in policy in order to be realized. It seems highly unlikely that global emissions will follow the pathway outlined in RCP 2.6 in particular; annual emissions would have to start declining in 2020. By contrast, RCPs 6.0 and 8.5 represent scenarios in which future emissions follow past trends with minimal to no change in policy and/or technology.


Global Mean Surface Temperature for Selected Climate Scenarios, 2031-50 and 2081-100

The four RCPs imply different effects on global temperatures. Figure A indicates the projected increases in temperature associated with each RCP scenario (relative to preindustrial levels).[1] The figure suggests that only the significant reductions in emissions underlying RCPs 2.6 and 4.5 can stabilize average global temperature increases at or around 2°C. Many scientists have suggested that it is critical to avoid increases in temperature beyond 2°C or even 1.5°C—larger temperature increases would produce extreme biophysical impacts and associated human welfare costs. It is worth noting that economic assessments of the costs and benefits from policies to reduce CO2 emissions do not necessarily recommend policies that would constrain temperature increases to 1.5°C or 2°C. Some economic analyses suggest that these temperature targets would be too stringent in the sense that they would involve economic sacrifices in excess of the value of the climate-related benefits (Nordhaus 2007, 2017). Other analyses tend to support these targets (Stern 2006). In scenarios with little or no policy action (RCPs 6.0 and 8.5), average global surface temperature could rise 2.9 to 4.3°C above preindustrial levels by the end of this century. One consequence of the temperature increase in these scenarios is that sea level would rise by between 0.5 and 0.8 meters (figure B).

Global Mean Sea Level Rise for Selected Climate Scenarios

Countries’ Relative Contributions to CO2 Emissions Are Changing

The extent of climate change is a function of the atmospheric stock of CO2 and other greenhouse gases, and the stock at any given point in time reflects cumulative emissions up to that point. Thus, the contribution a given country or region makes to global climate change can be measured in terms of its cumulative emissions.

Up to 1990, the historical responsibility for climate change was primarily attributable to the more-industrialized countries. Between 1850 and 1990, the United States and Europe alone produced nearly 75 percent of cumulative CO2 emissions (see figure C). Such historic responsibility has been a primary issue in debates about how much of the burden of reducing current and future emissions should fall on the shoulders of developed versus developing countries.

<img class=”aligncenter wp-image-619313 size-article-outset lazyload” src=”https://i1.wp.com/www.brookings.edu/wp-content/uploads/2019/10/20191018_ES_THP_ClimateFacts_Figure_C.jpg” alt=”Share of Cumulative CO2 Emissions by Geographic Region, 1850-1990 and 1850-2017″ />

Although the United States and other developed nations continue to be responsible for a large share of the current excess concentration of CO2, relative contributions and responsibilities are changing. As of 2017, the United States and Europe accounted for just over 50 percent of cumulative CO2 emitted into the atmosphere since 1850. A reason for this sharp decline (as indicated in figures C and D) is that CO2 emissions from China, India, and other developing countries have grown faster than emissions from the developed countries (though amongst major economies, the United States has one of the highest rates of per capita emissions in the world and is far ahead of China and India [Joint Research Centre 2018]). Therefore, it seems likely that in order to avert the worst effects of climate change, emissions reduction efforts will be required by both historic contributors—the United States and Europe—as well as more recently developing countries such as China and India.

<img class=”aligncenter wp-image-619313 size-article-outset lazyload” src=”https://i1.wp.com/www.brookings.edu/wp-content/uploads/2019/10/20191018_ES_THP_ClimateFacts_Figure_D.jpg” alt=”Annual CO2 Emissions by Geographic Region, 1950-2017″ />

Nations’ Pledges under the Paris Agreement Imply Significant Reductions in Emissions, but Not Enough to Avoid a 2°C Warming

The future of climate change might seem dismal in light of the recent increase in global emissions as well as the potential future growth in emissions, temperatures, and sea levels under RCPs 6.0 and 8.5. Failure to take any climate policy action would lead to annual emissions growth rates far above those that would prevent temperature increases beyond the focal points of 1.5°C and 2°C (figure E). As indicated earlier, cost-benefit analyses in various economic models lead to differing conclusions as to whether it is optimal to constrain temperature increases to 1.5°C or 2°C (Nordhaus 2007, 2016; Stern 2006).[2] Fortunately, countries have been taking steps to combat climate change, referred to in figure E as “Current policy” (which includes policy commitments made prior to the 2015 Paris Agreement). Comparing “No climate policies” and “Current policy” shows that the emissions reduction implied by current policies will lead to roughly 1°C lower global temperature by the end of the century. A large share of this lowered emission path is attributable to actions by states, provinces, and municipalities throughout the world.

Historical and Projected Annual Global GHG Emissions under Selected Policy Scenarios, 2010-2100

Further reductions are implied by the 2015 Paris Agreement, under which 195 countries pledged to take additional steps. The Paris Agreement’s pledges, if met, would keep global temperatures 0.5°C lower than “Current policy” and about 1.5°C lower than “No climate policy” in 2100 (see figure E). Although this can be viewed as a positive outcome, a morenegative perspective is that these policies would still allow temperatures in 2100 to be 2.6 to 3.2°C above preindustrial levels—significantly above the 1.5 or 2.0°C targets that have become focal points in policy discussions.

In the following set of facts, we describe the costs of climate change to the United States and to the world as well as potential policy solutions and their respective costs.

Fact 1: Damages to the U.S. economy grow with temperature change at an increasing rate.

The physical changes described in the introduction will have substantial effects on the U.S. economy. Climate change will affect agricultural productivity, mortality, crime, energy use, storm activity, and coastal inundation (Hsiang et al. 2017).

In figure 1 we focus on the economic costs imposed by climate change in the United States for different cumulative increases in temperature. It is immediately apparent that economic costs will vary greatly depending on the extent to which global temperature increase (above preindustrial levels) is limited by technological and policy changes. At 2°C of warming by 2080–99, Hsiang et al. (2017) project that the United States would suffer annual losses equivalent to about 0.5 percent of GDP in the years 2080–99 (the solid line in figure 1). By contrast, if the global temperature increase were as large as 4°C, annual losses would be around 2.0 percent of GDP. Importantly, these effects become disproportionately larger as temperature rise increases: For the United States, rising mortality as well as changes in labor supply, energy demand, and agricultural production are all especially important factors in driving this nonlinearity.

Looking instead at per capita GDP impacts, Kahn et al. (2019) find that annual GDP per capita reductions (as opposed to economic costs more broadly) could be between 1.0 and 2.8 percent under IPCC’s RCP 2.6, and under RCP 8.5 the range of losses could be between 6.7 and 14.3 percent. For context, in 2019 a 5 percent U.S. GDP loss would be roughly $1 trillion.

There is, of course, substantial uncertainty in these calculations. A major source of uncertainty is the extent of climate change over the next several decades, which depends largely on future policy choices and economic developments—both of which affect the level of total carbon emissions. As noted earlier, this uncertainty justifies more aggressive action to limit emissions and thereby help insure against the worst potential outcomes.

It is also important to highlight what figure 1 leaves out. Economic effects that are not readily measurable are excluded, as are costs incurred by countries other than the United States. In addition, if climate change has an impact on the growth rate (as opposed to the level) of output in each year, then the impacts could compound to be much larger in the future (Dell, Jones, and Olken 2012).[3]

U.S. Economic Damages from Climate Change in 2080-99 by Temperature Increase

Fact 2: Struggling U.S. counties will be hit hardest by climate change.

The effects of climate change will not be shared evenly across the United States; places that are already struggling will tend to be hit the hardest. To explore the local impacts of climate change, we use a summary measure of county economic vitality that incorporates labor market, income, and other data (Nunn, Parsons, and Shambaugh 2018), paired with county level costs as a share of GDP projected by Hsiang et al. (2017).[4]

Figure 2 shows that the bottom fifth of counties ranked by economic vitality will experience the largest damages, with the bottom quintile of counties facing losses equal in value to nearly 7 percent of GDP in 2080–99 under the RCP 8.5 scenario (a projection that assumes little to no additional climate policy action and warming of roughly 4.3°C above preindustrial levels).[5] Counties that will be hit hardest by climate change tend to be located in the South and Southwest regions of the United States (Muro, Victor, and Whiton 2019). Rao (2017) finds that nearly two million homes are at risk of being underwater by 2100, with over half of those being located in Florida, Louisiana, North Carolina, South Carolina, and Texas. More-prosperous counties in the United States are often in the Northeast, upper Midwest, and Pacific regions, where temperatures are lower and communities are less exposed to climate damage.

An important limitation of these estimates is that they assume that population in each county remains constant over time (Hsiang et al. 2017).[6] To the extent that people will adjust to climate change by moving to less-vulnerable areas, this adjustment could help to diminish aggregate national damages but may exacerbate losses in places where employment falls. Moreover, the limited ability of low-income Americans to migrate in response to climate change exposes them to particular hardship (Kahn 2017).

The concentration of climate damages in the South and among low-income Americans implies a disproportionate impact on minority communities. Geographic disadvantage is overlaid with racial disadvantage (Hardy, Logan, and Parman 2018), and Black, Latino, and indigenous communities are likely to bear a disproportionate share of climate change burden (Gamble and Balbus 2016).

Economic Damages to U.S. Counties from Climate Change in 2080-99 by Quintile of Economic Vitality Index

Fact 3: Globally, low-income countries will lose larger shares of their economic output.

Unlike other pollutants that have localized or regional effects, GHGs produce global effects. These emissions constitute a negative spillover at the widest scale possible: For example, emissions from the United States contribute to warming in China, and vice versa. Moreover, some places are much more exposed to economic damages from climate change than are other places; the same increase in atmospheric carbon concentration will cause larger per capita damages in India than in Iceland.

This means that carbon emissions and the damages from those emissions can be (and, in fact, are) distributed in very different ways. Figure 3 shows impacts on per capita GDP based on a study of the GDP growth effects of warming, highlighting the relatively high per capita income reductions in Latin America, Africa, and South Asia (though higher-income countries would lose more absolute aggregate wealth and output because of their higher levels of economic activity). The figure also uses a higher estimate of potential economic damages that takes into account impacts on productivity and growth that accumulate over time as opposed to looking at snapshots of lost activity in a given year. Thus, the estimates are higher than those presented in facts 1 and 2, highlighting both the uncertainty and the potentially disastrous outcomes that are possible.

Beyond showing the potentially destructive scale, this map suggests global inequity: Several of the regions that contribute relatively little to the climate change problem—regions with relatively low per capita emissions—nevertheless suffer relatively high climate damages per capita.

Climate Change Effect on per Capita GDP in 2100 by Country

Fact 4: Increased mortality from climate change will be highest in Africa and the Middle East.

The reductions in economic output highlighted in fact 3 are not the only damages expected from climate change. One important example is the effect of climate change on mortality. In places that already experience high temperatures, climate change will exacerbate heat-related health issues and cause mortality rates to rise.

Figure 4 relies on estimates from Carleton et al. (2018) to show climate change’s expected effects on mortality in 2100. The geographical distribution of the impact on mortality is very uneven. Some of the most-significant impacts are in the equatorial zone because these locations are already very hot, and high temperatures become increasingly dangerous as temperatures rise further. For example, Accra, Ghana is projected to experience 160 additional deaths per 100,000 residents. In colder regions, mortality rates are sometimes predicted to fall, reflecting decreases in the number of dangerously cold days: Oslo, Norway is projected to experience 230 fewer deaths per 100,000. But for the world as a whole, negative effects are predominant, and on average 85 additional deaths per 100,000 will occur (Carleton et al. 2018).

Also evident in figure 4 is the role of income. Wealthier places are better able to protect themselves from the adverse consequences of climate change. This is a factor in projections of mortality risk from climate change: the bottom third of countries by income will experience almost all of the total increase in mortality rates (Carleton et al. 2018).

Mortality effects are disproportionately concentrated among the elderly population. This is true whether the effects are positive (when dangerously cold days are reduced) or negative (when dangerously hot days are increased) (Carleton et al. 2018; Deschenes and Moretti 2009).

Mortality Impacts from Climate Change in 2100 by Region

Fact 5: Energy intensity and carbon intensity have been falling in the U.S. economy.

The high-damage climate outcomes described in previous facts are not inevitable: There are good reasons to believe that substantial emissions reductions are attainable. For example, not only has the emissions-to-GDP ratio of the U.S. economy declined over the past two decades, but during the last decade the absolute level of emissions has declined as well, despite the growth of the economy. From a peak in 2007 through 2017, U.S. carbon emissions have fallen 14 percent while output grew 16 percent (Bureau of Economic Analysis 2007–17; U.S. Environmental Protection Agency [EPA] 2007–17; authors’ calculations). This reversal was produced by a combination of declining energy intensity of the U.S. economy (figure 5a) and declining carbon intensity of U.S. energy use (figure 5b). However, emissions increased in 2018, which suggests that sound policy will be needed to continue making progress (Rhodium Group 2019).

U.S. energy intensity (defined as energy consumed per dollar of GDP) has been falling both in times of economic expansion and contraction, allowing the economy to grow even as energy use falls. This has been crucial for mitigating climate change damages (CEA 2017; Obama 2017). Some estimates suggest that declining energy intensity has been the biggest contributor to U.S. reductions in carbon emissions (EIA 2018). Technological advancements and energy efficiency improvements have in turn driven the reduction in energy intensity (Metcalf 2008; Sue Wing 2008).

At the same time that energy intensity has fallen, the carbon intensity of energy use has also fallen in each of the major sectors (shown in figure 5b). Improved methods for horizontal drilling have led to substantial increases in the supply of low-cost natural gas and less use of (relatively carbon-intensive) coal (CEA 2017).[7] Technological advances have also helped substantially reduce the cost of providing power from renewable energy sources like wind and solar. From 2008 to 2015, roughly two thirds of falling carbon intensity in the power sector came from using cleaner fossil fuels and one third from an increased use of renewables (CEA 2017). Non-hydro-powered renewable energy has risen substantially over a short period of time, from 4 percent of all net electricity generation in 2009 to 10 percent in 2018 (EIA 2019a; authors’ calculations).

Energy Consumption Per Dollar of Real GDP, 1973-2018 and Carbon Intensity of Energy Use by Sector, 1973-2018

Fact 6: The price of renewable energy is falling.

The declining cost of producing renewable energy has played a key role in the trends described in fact 5. Figure 6 shows the declining prices of solar and wind energy—not including public subsidies—over the 2010–17 period. Because these price decreases have followed largely from technology induced supply increases, solar and wind energy now play a more-important role in the U.S. energy mix (CEA 2017). In many settings, however, clean energy remains more expensive on average than fossil fuels (The Hamilton Project [THP] and the Energy Policy Institute at the University of Chicago [EPIC] 2017), highlighting the need for continued technological advances.

The increasing share of renewables in energy supply is due in part to cost-reducing advances in technology and increased exploitation of economies of scale. Government subsidies—justified by the social costs of carbon emissions—for renewable energy have also played a role. When the negative spillovers from CO2 emissions are incorporated into the price of fossil fuels, many forms of clean energy are far cheaper than many fossil fuels (THP and EPIC 2017). However, making a much broader use of clean energy faces technological hurdles that have not yet been fully addressed. Renewable energy sources are in many cases intermittent—they make power only when the wind blows or the sun shines—and shifting towards more renewable energy production may require substantial improvements in battery technology and changes to how the electricity market prices variability (CEA 2016). The technological developments that drive falling clean energy prices are the product of public and private investments. In a Hamilton Project policy proposal, David Popp (2019) examines ways to encourage faster development and deployment of clean energy technologies.

Change in Levelized Cost of Energy for Solar and Wind, 2010-17

Fact 7: Some emissions abatement approaches are much more costly than others.

There are many ways to reduce net carbon emissions, from better livestock management to renewable fuel subsidies to reforestation. Each of these abatement strategies comes with its own costs and benefits. To facilitate comparisons, researchers have calculated the cost per ton of CO2-equivalent emissions.[8] We show high and low estimates of these average costs in figure 7, reproduced from Gillingham and Stock (2018).[9]

Less-expensive programs and policies include the Clean Power Plan—a since-discontinued 2014 initiative to reduce power sector emissions—as well as methane flaring regulations and reforestation. By contrast, weatherization assistance and the vehicle trade-in policy Cash for Clunkers are more expensive (see figure 7). It is important to recognize that some policies may have goals other than emissions abatement, as with Cash for Clunkers, which also aimed to provide fiscal stimulus after the Great Recession (Li, Linn, and Spiller 2013; Mian and Sufi 2012).

But when the goal is to reduce emissions at the lowest cost, economic theory and common sense suggest that the cheapest strategies for abating emissions should be implemented first. State and federal policy choices can play an important role in determining which of the options shown in figure 7 are implemented and in what order.

A common approach is to impose certain emissions standards—for example, a low-carbon fuel standard. The difficulty with this approach is that, in some cases, standards require abatement methods involving relatively high costs per ton while some low-cost methods are not implemented. This can reflect government regulators’ limited information about abatement costs or political pressures that favor some standards over others. By contrast, a carbon price—discussed in facts 8 through 10—helps to achieve a given emissions reduction target at the minimum cost by encouraging abatement actions that cost less than the carbon price and discouraging actions that cost more than that price.

However, policies other than a carbon price are often worthy of consideration. In a Hamilton Project proposal, Carolyn Fischer describes the situations in which clean performance standards can be implemented in a relatively efficient manner (2019).[10]

Average Abatement Costs for Selected Policy Options

Fact 8: Numerous carbon pricing initiatives have been introduced worldwide, and the prices vary significantly.

At the local, national, and international levels, 57 carbon pricing programs have been implemented or are scheduled for implementation across the world (World Bank 2019). Figure 8 plots some of the key national and U.S. subnational initiatives,
showing carbon taxes in green and cap and trade in purple. By imposing a cost on emissions, a carbon price encourages activities that can reduce emissions at a cost less than the carbon price.

Immediately apparent from figure 8 is the wide range of the carbon prices, reflecting the range of carbon taxes and aggregate emissions caps that different governments have introduced. At the highest end is Sweden with its price of $126 per ton; by contrast, Poland and Ukraine have imposed prices just above zero.[11] A sufficiently high carbon price would change the cost-benefit assessment of some existing nonprice policies, as described in a Hamilton Project proposal by Roberton Williams (2019).

A crucial question for policy is the appropriate level of a carbon price. According to economic theory, efficiency is maximized when the carbon price is equal to the social cost of carbon.[12] In other words, a carbon price at that level would not only facilitate the adoption of the lowest-cost abatement activities (as discussed under fact 7) but would also achieve the level of overall emissions abatement that maximizes the difference between the climate-related benefits and the economic costs.[13] Although setting the carbon price equal to the social cost of carbon maximizes net benefits, the monetized environmental benefits also exceed the economic costs when the carbon price is below (or somewhat above) the optimal value.

Estimates of the social cost of carbon depend on a wide range of factors, including the projected biophysical impacts associated with an incremental ton of CO2 emissions, the monetized value of these impacts, and the discount rate applied to convert future monetized damages into current dollars.[14] As of 2016, the Interagency Working Group on Social Cost of Carbon—a partnership of U.S. government agencies—reported a focal estimate of the social cost of carbon (SCC) at $51 (adjusted for inflation to 2018 dollars) per ton of CO2 (indicated by the dashed line in figure 8).[15]

Prices for Selected Carbon Pricing Initiatives

Fact 9: Most global GHG emissions are still not covered by a carbon pricing initiative.

Just as important as the carbon price is the share of global emissions facing the price. Many countries do not price carbon, and in many of the countries that do, important sources of emissions are not covered. When implementing carbon prices, policymakers have tended to start with the power sector and exclude some other emissions sources like energy-intensive manufacturing (Fischer 2019).

The carbon pricing systems that do exist are not evenly distributed across the world (World Bank 2019). Programs are heavily concentrated in Europe, Asia, and, to a lesser extent, North America. This distribution aligns roughly with the distribution of emissions, though the United States is an outlier: as discussed in the introduction, Europe has generated 33 percent of global CO2 emissions since 1850, the United States 25 percent, and China 13 percent (Ritchie and Roser 2017; authors’ calculations). According to currently scheduled and implemented initiatives, in 2020 the United States will be pricing only 1.0 percent of global GHG emissions; by comparison, Europe will be pricing 5.5 percent, and China will be pricing 7.0 percent (see figure 9).

Figure 9 shows each region’s priced emissions—including both implemented and planned (in 2020) carbon pricing—as a share of total global emissions. Between 2005 and 2012, the European Union’s cap and trade program was the only major carbon pricing program. However since the Paris Agreement, there has been a growing number of implemented and scheduled programs, with the largest of these being China’s national cap and trade program set to take effect in 2020. Despite this activity, it is likely that a carbon price will still not be applied to 80 percent of global emissions of GHGs in 2020 (World Bank 2019; authors’ calculations).

Share of Global GHG Emissions Covered by Implemented and Scheduled Carbon Pricing Initiatives, 2000-20

Fact 10: Proposed U.S. carbon taxes would yield significant reductions in CO2 and environmental benefits in excess of the costs.

To assess proposals for a national U.S. carbon price, it is important to understand the size of the likely emissions reduction. Figure 10 shows projections of emissions reductions from Barron et al. (2018) under different assumptions about the level and subsequent growth rate of a U.S. carbon price. Over the 2020-30 period a carbon tax starting at $25 per ton in 2020 and increasing at 1 percent annually above the rate of inflation achieves a reduction in CO2 of 10.5 gigatons, or an 18 percent reduction from the baseline (emissions level in 2005). A more-ambitious $50 per ton price, rising at 5 percent subsequently, would reduce near-term emissions by an estimated 30 percent.[16]

A major attraction of using carbon pricing to achieve emissions reductions (as compared to adopting standards and other conventional regulations for this purpose) is its ability to induce the market to adopt the lowest-cost methods for reducing emissions. As of late 2019, nine U.S. states participate in the Regional Greenhouse Gas Initiative (RGGI), in which electric power plants trade permits that currently have a market price of around $5.20 per short ton of carbon 10. Proposed U.S. carbon taxes would yield significant reductions in CO2 and environmental benefits in excess of the costs. (RGGI Inc. 2019).[17] That means that electric power plants covered under the RGGI are able to find methods of emissions abatement at a cost of $5.20 per ton at the margin and would buy permits at that price rather than undertake any abatement opportunities at a higher cost. A lower aggregate cap—or a higher carbon tax—would continue to select for the abatement approaches that have the lowest costs per ton for a given sector.

Even at much higher levels, emissions pricing leads to environmental benefits—reduced climate and other environmental damages—that exceed the economic sacrifices involved (i.e., the expense of reducing emissions).[18] A central estimate of the social cost of carbon (in 2018 dollars) is $51 per ton (Interagency Working Group on Social Cost of Carbon 2016). However, many recent proposals have tended to entail carbon prices below this level.[19] Goulder and Hafstead (2017) find that a U.S. carbon tax of $20 per ton in 2019, increasing at 4 percent in real terms for 20 years after that, yields climate related benefits that exceed the economic costs by about 70 percent.[20]

Cumulative CO2 Reductions for Selected Carbon Price Paths, 2020-30

The authors did not receive financial support from any firm or person for this article or from any firm or person with a financial or political interest in this article. None of the authors is currently an officer, director, or board member of any organization with a financial or political interest in this article.

Report Produced by The Hamilton Project

Climate Change, International

The world has a third pole – and it’s melting quickly

Gaia Vince

Many moons ago in Tibet, the Second Buddha transformed a fierce nyen (a malevolent mountain demon) into a neri (the holiest protective warrior god) called Khawa Karpo, who took up residence in the sacred mountain bearing his name. Khawa Karpo is the tallest of the Meili mountain range, piercing the sky at 6,740 metres (22,112ft) above sea level. Local Tibetan communities believe that conquering Khawa Karpo is an act of sacrilege and would cause the deity to abandon his mountain home. Nevertheless, there have been several failed attempts by outsiders – the best known by an international team of 17, all of whom died in an avalanche during their ascent on 3 January 1991. After much local petitioning, in 2001 Beijing passed a law banning mountaineering there.Advertisement

However, Khawa Karpo continues to be affronted more insidiously. Over the past two decades, the Mingyong glacier at the foot of the mountain has dramatically receded. Villagers blame disrespectful human behaviour, including an inadequacy of prayer, greater material greed and an increase in pollution from tourism. People have started to avoid eating garlic and onions, burning meat, breaking vows or fighting for fear of unleashing the wrath of the deity. Mingyong is one of the world’s fastest shrinking glaciers, but locals cannot believe it will die because their own existence is intertwined with it. Yet its disappearance is almost inevitable.

Khawa Karpo lies at the world’s “third pole”. This is how glaciologists refer to the Tibetan plateau, home to the vast Hindu Kush-Himalaya ice sheet, because it contains the largest amount of snow and ice after the Arctic and Antarctic – the Chinese glaciers alone account for an estimated 14.5% of the global total. However, quarter of its ice has been lost since 1970. This month, in a long-awaited special report on the cryosphere by the Intergovernmental Panel on Climate Change (IPCC), scientists will warn that up to two-thirds of the region’s remaining glaciers are on track to disappear by the end of the century. It is expected a third of the ice will be lost in that time even if the internationally agreed target of limiting global warming by 1.5C above pre-industrial levels is adhered to.

Whether we are Buddhists or not, our lives affect, and are affected by, these tropical glaciers that span eight countries. This frozen “water tower of Asia” is the source of 10 of the world’s largest rivers, including the Ganges, Brahmaputra, Yellow, Mekong and Indus, whose flows support at least 1.6 billion people directly – in drinking water, agriculture, hydropower and livelihoods – and many more indirectly, in buying a T-shirt made from cotton grown in China, for example, or rice from India.Advertisement

Joseph Shea, a glaciologist at the University of Northern British Columbia, calls the loss “depressing and fear-inducing. It changes the nature of the mountains in a very visible and profound way.”

Yet the fast-changing conditions at the third pole have not received the same attention as those at the north and south poles. The IPCC’s fourth assessment report in 2007 contained the erroneous prediction that all Himalayan glaciers would be gone by 2035. This statement turned out to have been based on anecdote rather than scientific evidence and, perhaps out of embarrassment, the third pole has been given less attention in subsequent IPCC reports.

There is also a dearth of research compared to the other poles, and what hydrological data exists has been jealously guarded by the Indian government and other interested parties. The Tibetan plateau is a vast and impractical place for glaciologists to work in and confounding factors make measurements hard to obtain. Scientists are forbidden by locals, for instance, to step out on to the Mingyong glacier, meaning they have had to use repeat photography to measure the ice retreat.

In the face of these problems, satellites have proved invaluable, allowing scientists to watch glacial shrinkage in real time. This summer, Columbia University researchers also used declassified spy-satellite images from the cold war to show that third pole ice loss has accelerated over this century and is now roughly double the melt rate of 1975 to 2000, when temperatures were on average 1C lower. Glaciers in the region are currently losing about half a vertical metre of ice per year because of anthropogenic global heating, the researchers concluded. Glacial melt here carries significant risk of death and injury – far more than in the sparsely populated Arctic and Antarctic – from glacial lake outbursts (when a lake forms and suddenly spills over its banks in a devastating flood) and landslides caused by destabilised rock. Whole villages have been washed away and these events are becoming increasingly regular, even if monitoring and rescue systems have improved. Satellite data shows that numbers and sizes of such risky lakes in the region are growing. Last October and November, on three separate occasions, debris blocked the flow of the Yarlung Tsangpo in Tibet, threatening India and Bangladesh downstream with flooding and causing thousands to be evacuated.

An artificial glacier in Ladakh, created by engineer and farmer Chewang Norphel.
 An artificial glacier in Ladakh, created by engineer and farmer Chewang Norphel. Photograph: Chewang Norphel

One reason for the rapid ice loss is that the Tibetan plateau, like the other two poles, is warming at a rate up to three times as fast as the global average, by 0.3C per decade. In the case of the third pole, this is because of its elevation, which means it absorbs energy from rising, warm, moisture-laden air. Even if average global temperatures stay below 1.5C, the region will experience more than 2C of warming; if emissions are not reduced, the rise will be 5C, according to report released earlier this year by more than 200 scientists for the Kathmandu-based International Centre for Integrated Mountain Development (ICIMOD). Winter snowfall is already decreasing and there are, on average, four fewer cold nights and seven more warm nights per year than 40 years ago. Models also indicate a strengthening of the south-east monsoon, with heavy and unpredictable downpours. “This is the climate crisis you haven’t heard of,” said ICIMOD’s chief scientist, Philippus Wester.

There is another culprit besides our CO2 emissions in this warming story, and it’s all too evident on the dirty surface of the Mingyong glacier: black carbon, or soot. A 2013 study found that black carbon is responsible for 1.1 watts per square metre of the Earth’s surface of extra energy being stored in the atmosphere (CO2 is responsible for an estimated 1.56 watts per square metre). Black carbon has multiple climate effects, changing clouds and monsoon circulation as well as accelerating ice melt. Air pollution from the Indo-Gangetic Plains – one of the world’s most polluted regions – deposits this black dust on glaciers, darkening their surface and hastening melt. While soot landing on dark rock has little effect on its temperature, snow and glaciers are particularly vulnerable because they are so white and reflective. As glaciers melt, the surrounding rock crumbles in landslides, covering the ice with dark material that speeds melt in a runaway cycle. The Everest base camp, for instance, at 5,300 metres, is now rubble and debris as the Khumbu glacier has retreated to the icefall.

The immense upland of the third pole is one of the most ecologically diverse and vulnerable regions on Earth. People have only attempted to conquer these mountains in the last century, yet in that time humans have subdued the glaciers and changed the face of this wilderness with pollution and other activities. Researchers are now beginning to understand the scale of human effects on the region – some have experienced it directly: many of the 300 IPCC cryosphere report authors meeting in the Nepalese capital in July were forced to take shelter or divert to other airports because of a freak monsoon.

But aAside from such inconveniences, what do these changes mean for the 240 million people living in the mountains? Well, in many areas, it has been welcomed. Warmer, more pleasant winters have made life easier. The higher temperatures have boosted agriculture – people can grow a greater variety of crops and benefit from more than one harvest per year, and that improves livelihoods. This may be responsible for the so-called Karakoram anomaly, in which a few glaciers in the Pakistani Karakoram range are advancing in opposition to the general trend. Climatologists believe that the sudden and massive growth of irrigated agriculture in the local area, coupled with unusual topographical features, has produced an increase in snowfall on the glaciers which currently more than compensates for their melting.Advertisement

Elsewhere, any increase in precipitation is not enough to counter the rate of ice melt and places that are wholly reliant on meltwater for irrigation are feeling the effects soonest. “Springs have dried drastically in the past 10 years without meltwater and because infrastructure has cut off discharge,” says Aditi Mukherji, one of the authors of the IPCC report.

A man tends a vegetable plot in the Karakoram range.
 A man tends a vegetable plot in the Karakoram range. Photograph: Luis Dafos/Getty Images

Known as high-altitude deserts, places such as Ladakh in north-eastern India and parts of Tibet have already lost many of their lower-altitude glaciers and with them their seasonal irrigation flows, which is affecting agriculture and electricity production from hydroelectric dams. In some places, communities are trying to geoengineer artificial glaciers that divert runoff from higher glaciers towards shaded, protected locations where it can freeze over winter to provide meltwater for irrigation in the spring.

Only a few of the major Asian rivers are heavily reliant on glacial runoff – the Yangtze and Yellow rivers are showing reduced water levels because of diminished meltwater and the Indus (40% glacier-fed) and Yarkand (60% glacier-fed) are particularly vulnerable. So although mountain communities are suffering from glacial disappearance, those downstream are currently less affected because rainfall makes a much larger contribution to rivers such as the Ganges and Mekong as they descend into populated basins. Upstream-downstream conflict over extractions, dam-building and diversions has so far largely been averted through water-sharing treaties between nations, but as the climate becomes less predictable and scarcity increases, the risk of unrest within – let alone between – nations grows.

Towards the end of this century, pre-monsoon water-flow levels in all these rivers will drastically reduce without glacier buffers, affecting agricultural output as well as hydropower generation, and these stresses will be compounded by an increase in the number and severity of devastating flash floods. “The impact on local water resources will be huge, especially in the Indus Valley. We expect to see migration out of dry, high-altitude areas first but populations across the region will be affected,” says Shea, also an author on the ICIMOD report.

As the third pole’s vast frozen reserves of fresh water make their way down to the oceans, they are contributing to sea-level rise that is already making life difficult in the heavily populated low-lying deltas and bays of Asia, from Bangladesh to Vietnam. What is more, they are releasing dangerous pollutants. Glaciers are time capsules, built snowflake by snowflake from the skies of the past and, as they melt, they deliver back into circulation the constituents of that archived air. Dangerous pesticides such as DDT (widely used for three decades before being banned in 1972) and perfluoroalkyl acids are now being washed downstream in meltwater and accumulating in sediments and in the food chain.

Ultimately the future of this vast region, its people, ice sheets and arteries depends – just as Khawa Karpo’s devotees believe – on us: on reducing our emissions of greenhouse gases and other pollutants. As Mukherji says, many of the glaciers that haven’t yet melted have effectively “disappeared because in the dense air pollution, you can no longer see them”.

The report firt published in The Guardian

Climate Change, Environment

Cloudburst in Arunachal; tourists stranded in flash flood, road closed

 

A calamitous cloudburst leading to massive rainfall and flash flood has made disaster in destrying many houses, bridges and roads in Tenga, Arunachal Pradesh.

Several hundred people were reported to be stranded while many others were missing in the flash flood which left a trail of devastation at Kaspi Nala near Nag-Mandir Tenga in West Kameng District of Arunachal Pradesh on Monday evening.

An RCC Bridge between Kaspi and Nagmandir has been washed away by floodwater.

The Army and paramilitary forces along with disaster management authorities have been deployed to rescue the victims.

Meanwhile, the West Kameng district administration has closed the Bhalukpong to Tawang  road.

The cloudburst triggered the flash flood on the evening of Monday, damaging over four houses, one boys’ hostel and one hilly restaurant along with several vehicles and motorcycles, according to tourists witnessed.

Earlier in the month of April, Bomdila, the headquarters of West Kameng district experienced cloudburst causing widespread damages to the places in proximity of the township.

The cloudburst was followed by torrential rain and hailstorm which created havoc in the township. According to Chandan Kumar Duarah, a science journalist says the cloudbust and flash flood attributed to massive deforestation, soil cutting in the region and climate change.

The rain lashed the district headquarters for over an hour resulting in chocking of drains and spread of debris all around.

At least 800 people were reported to be stranded while many others were missing in the flash flood which left a trail of devastation at Tenga in West Kameng District of Arunachal Pradesh on Monday evening.

The Army and paramilitary forces along with disaster management authorities have been deployed to rescue the victims.

The cloudburst was followed by torrential rain and hailstorm which created havoc in the township.

The rain lashed the district headquarters for over an hour resulting in chocking of drains and spread of debris all around.

Climate Change, International

European heat wave sees Germany put speed limits on autobahn

Large parts of western and central Europe sweated under blazing temperatures on June 26, with authorities in one German region imposing temporary speed limits on some stretches of the autobahn, the federal controlled-access higyway system designed for high-speed vehicular traffic, as a precaution against heat damage.

Authorities have warned that temperatures could top 40 degrees Celsius (104 Fahrenheit) in parts of the continent over the coming days as a plume of dry, hot air moves north from Africa.

The transport ministry in Germany’s eastern Saxony-Anhalt state said it has imposed speed limits of 100 kmph or 120 kmph on several short stretches of the highway until further notice. Those stretches usually have no speed limit.

On the evening of June 25, German railway operator Deutsche Bahn called rescue services to Duesseldorf Airport station as a precaution because two trains’ air conditioning systems weren’t working properly, but neither had to be evacuated.

In Paris, authorities banned older cars from the city for the day as a heat wave aggravates the city’s pollution.

Regional authorities estimate these measures affect nearly 60% of vehicles circulating in the Paris region, including many delivery trucks and older cars with higher emissions than newer models. Violators face fines.

Around France, some schools have been closed because of the high temperatures, which are expected to go up to 39 degrees Celsius (102 Fahrenheit) in the Paris area later this week and bake much of the country, from the Pyrenees in the southwest to the German border in the northeast.

Such temperatures are rare in France, where most homes and many buildings do not have air conditioning.

French charities and local officials are providing extra help for the elderly, the homeless and the sick this week, remembering that some 15,000 people, many of them elderly, died in France during a 2003 heat wave.

Prime Minister Edouard Philippe cited the heat wave as evidence of climate destabilization and vowed to step up the government’s fight against climate change.

About half of Spain’s provinces are on alert for high temperatures, which are expected to rise as the weekend approaches.

The northeastern city of Zaragoza was forecast to be the hottest on Wednesday at 39 degrees Celsius, building to 44 degrees Celsius on Saturday, according to the government weather agency AEMET.

In southwestern Europe, however, some people had other reasons to complain during their summer vacation- the Portuguese capital Lisbon, on Europe’s Atlantic coast, awoke cloudy and wet on Wednesday.                           AP