The IPCC isn't the only group that has taken up the question of climate change. In the U.S., many government agencies (such as the National Oceanic and Atmospheric Administration [NOAA], National Aeronautics and Space Administration [NASA], and Environmental Protection Agency [EPA]), non-profits like the National Center for Atmospheric Research (NCAR), and universities have groups that work on climate change.

The U.S. Climate Change Science Program is tasked with integrating federal research on climate and global change and has produced a number of reports on climate. In addition, the National Academy of Sciences (NAS), which was created in 1863 to provide independent advice to the U.S. government on scientific and technological issues, has also worked on the topic. All of these groups support the major conclusions of the IPCC.