In the context of climate change, mitigation is a human intervention to reduce the sources or enhance the sinks of greenhouse gases.
Examples include using fossil fuels more efficiently for industrial processes or electricity generation, switching to solar energy or wind power, improving the insulation of buildings, and expanding forests and other "sinks" to remove greater amounts of carbon dioxide from the atmosphere.
(UNFCCC glossary, 14 August 2007)
=> Glossary