The Himalaya region is among the most vulnerable to climate change. Retreating glaciers reduce dry-season water availability and increase the risk of glacial lake outburst floods, while increased climate variability and changes in rainfall and monsoon patterns could threaten regional water, food security and change the occurrence of landslides and floods.
Climate change in the Himalaya is partly a result of carbon dioxide, which can remain in the atmosphere and impact the climate for centuries. However, it is also caused by ‘short lived climate pollutants’ (SLCPs) that stay in the atmosphere briefly, but still impact on the climate. In recent decades the Himalayan region has experienced increasing urban and rural air pollution, affecting people’s health, agriculture, visibility and tourism. Globally, air pollutants have been shown to cause as many as seven million premature deaths every year, destroy millions of tons of crops, and push up the earth’s temperature, contributing to climate change.
The short atmospheric lifetime of SLCPs has two important consequences for policy makers: actions to reduce their emissions yield results much faster than actions to reduce CO2 emissions, and they are most concentrated near their source regions. Because they also have significant impact on health and agriculture, action to reduce emissions bring significant non-climate benefits. Many of the biggest sources of SLCPs can be addressed using well-established measures that are cost-effective to implement. The Climate and Clean Air Coalition (CCAC) was set up three years ago to reduce these pollutants, it now has 100 members and is focused on finding practical solutions to reduce four key short-lived climate pollutants: black carbon, tropospheric ozone, methane, and hydrofluorocarbons (HFCs).
In the Himalayan region, action on just one of the SLCPs, black carbon (or ’soot’) could have multiple benefits for health, food and water security and the environment. Household cook stoves are one of the main sources of black carbon in the Himalayan region. Typical cook stoves burn wood, dung and crop residues for domestic energy, and usually have very incomplete combustion, which pollute both outdoor and indoor air. Reducing exposure to black carbon pollution from cook stoves could cut premature deaths in the region by as much as 750,000 people. Broaden the focus to diesel engines, brick production, and other pollution sources and the number goes even higher. The effect on agriculture could be just as dramatic: more than 15 million metric tons of staple crops could be added to the region’s food supply with the reduction of black carbon and methane.
