The United Nations Environment Programme is a programme of the United Nations that coordinates the organization's environmental activities and assists developing countries in implementing environmentally sound policies and practices.
The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for the assessment of climate change. It reviews and assesses the most recent scientific, technical and socio-economic information produced worldwide relevant to the understanding of climate change.
The U.S. Global Change Research Program (USGCRP) was established by Congress in 1990 to coordinate federal research and investments in understanding the forces shaping the global environment, both human and natural, and their impacts on society.
The Union of Concerned Scientists is a nonprofit science advocacy organization based in the United States.