Energy Information Administration, current statistics
The Association for the Study of Peak Oil and Gas
US Climate Change Science Program
Intergovernmental Panel on Climate Change (IPCC)
International Atomic Energy Agency
Environmental Protection Agency
Earthtrends - World Resources Institute
American Society of Heating, Refrigeration, and Air-conditioning Engineers
Center for Renewable Energy and Sustainable Technology
American Council for an Energy-Efficient Economy
American Wind Energy Association
Danish Wind Industry Association
Worldwatch Institute - State of the World
Environmental and Energy Technologies, Lawrence Berkeley Laboratory
Education from Florida Solar Energy Center
PEW Center on Global Climate Change