Some degree of global change is irreversible. NASA's role is to provide data needed to understand and model Earth's climate, which can help policymakers make informed decisions on steps to mitigate global change and its effects.
It is not NASA's role to develop solutions or public policies related to global climate change. Instead, the agency's mission is to provide the scientific data needed to understand climate change and to evaluate the impact of efforts to control it. (For more information, see NASA's role.)
The following selected resources from governmental organizations provide information about options for climate change mitigation.
Energy policy options
U.S. Department of Energy: Climate Change Describes strategies currently being pursued or considered to reduce carbon emissions and address global climate change. http://www.energy.gov/environment/climatechange.htm
The State of California's Climate Change Portal This site provides a large number of links to state reports on climate change mitigation and adaptation options. http://www.climatechange.ca.gov/research/index.html
United Nations Framework Convention on Climate Change Online newsletter concerning issues on and about the U.N.'s convention on long-term climate change. http://unfccc.int/2860.php