Strategies to reduce SLCPs will typically target methane, tropospheric ozone, black carbon and hydrofluorocarbons. Other short-lived climate forcers, such as sulphur dioxide and organic carbon, lead to cooling and are therefore not targeted. These SLCP reduction strategies will sometimes affect only a single pollutant, for example intermittent rice irrigation affects methane alone. Nonetheless, most strategies to reduce SLCPs will affect multiple pollutants. It follows that an evaluation of mitigation measures must examine emissions of both long-lived GHGs and all SLCPs, to assess the net impact on warming.
Sustained SLCP reduction strategies can help limit long-term warming, especially when combined with CO2 reduction, and therefore contribute to closing the emissions gap.
About the report
The UN Environment Emissions Gap Report 2017 presents an assessment of current national mitigation efforts and the ambitions countries have presented in their Nationally Determined Contributions, which form the foundation of the Paris Agreement.
The report has been prepared by an international team of leading scientists, assessing all available information. The governments of countries mentioned specifically in the report have been invited to comment on the specific assessment findings; independent experts have also been invited to review the different chapters.