Pew Global Climate Change

World Resources Institute

Natural Resources Defense Council

Intergovernmental Panel on Climate Change

National Oceanic and Atmospheric Administration

United Nations Framework Convention on Climate Change

United Nations Environment Program

United States Department of State

United States Environmental Protection Agency

United States National Assessment

The United States Global Change Research Program (USGCRP)

Carbon Dioxide Information Analysis Center

Emissions Database for Global Atmospheric Research

International Institute for Applied Systems Analysis

International Energy Agency, Greenhouse Gas Programme