The Climate and Clean Air Coalition (CCAC)

In the '“Integrated Assessment of Black Carbon and Tropospheric Ozone” of UNEP and WMO, IIASA identified 16 practical measures that would improve human health, secure crop yields and, at the same time, reduce global temperature increase in the near-term by up to 0.5 degrees.

To initiate concrete action on these measures, US State Secretary Hillary Clinton launched a 'Climate and Clean Air Coalition to Reduce Short Lived Climate Pollutants' in February 2012,  complementing efforts on CO2 emissions taken by countries under the UN Framework Convention on Climate Change. By July 2012, the Coalition was joined by 18 countries and nine non-state partners.

Pollutants that are short-lived in the atmosphere such as black carbon, methane and hydrofluorocarbons (HFCs) are responsible for a substantial fraction of current global warming with particularly large impacts in urban areas and sensitive regions of the world like the Arctic, and have harmful health and environmental impacts. Addressing these short lived climate pollutants can have immediate, multiple benefits. Reducing them will protect human health and the environment now and slow the rate of climate change within the first half of this century.

The 'Climate and Clean Air Coalition' catalyzes rapid reductions in harmful pollutants to protect human health and the environment now, and slow the rate of climate change within the first half of this century. 

The Coalition's initial focus is on methane, black carbon, and HFCs. At the same time, Partners recognize that action on Short lived climate pollutants must complement and supplement, not replace, global action to reduce carbon dioxide, in particular efforts under the UNFCCC.


The Coalition's objectives are to address short lived climate pollutants by:

  1. Raising awareness of short lived climate pollutant impacts and mitigation strategies;
  2. Enhancing and developing new national and regional actions, including by identifying and overcoming barriers, enhancing capacity, and mobilizing support;
  3. Promoting best practices and showcasing successful efforts; and
  4. Improving scientific understanding of short lived climate pollutant impacts and mitigation strategies.

The Coalition intends to serve as a forum for assessing progress in addressing the challenge of short lived climate pollutants and for mobilizing resources to accelerate action. It works to catalyse new actions as well as to highlight and bolster existing efforts on near-term climate change and related public health, food and energy security, and environmental issues.

IIASA contributions

  • In its contribution to the UNEP/WMO assessment of black carbon and troposeheric ozone, IIASA has catalyzed the coalition by identifying the 16 measures that could lead to immediate health and vegetation benefits while slowing down global temperature increase.
  • IIASA's Zig Klimont attended the Coalition's workshop on brick production to achieve quick-wins for public health, the climate and development (Guanajuato, Mexico, September 4, 2012) and presented the findings of the UNEP assessment derived from IIASA's GAINS model.
  • Markus Amann has been appointed as a member of Scientific Advisory Panel, which will be responsible for keeping the Coalition abreast of new science development on short lived climate pollutants, answer specific questions of the Coalition and inform policy discussions.

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Last edited: 25 June 2014


Markus Amann

Program Director

Air Quality and Greenhouse Gases

T +43(0) 2236 807 432

Zbigniew Klimont

Research Scholar

Air Quality and Greenhouse Gases

T +43(0) 2236 807 547

International Institute for Applied Systems Analysis (IIASA)
Schlossplatz 1, A-2361 Laxenburg, Austria
Phone: (+43 2236) 807 0 Fax:(+43 2236) 71 313