NOAA Monitoring

NOAA Climate Monitoring Portal (NOAA)

NOAA State of the Climate (SOTC)

BAMS State of the Climate [BAMS SOTC]

NOAA Global Monitoring Division (GHG Data) [NOAA ESRL GMD]

Satellites

NASA

Copernicus Earth Observation Programme

Copernicus Climate Change Service [C3S]

Intergovernmental Panel on Climate Change (IPCC)

Web Page and Assessments

Reports

U.S. Global Change Research Program

Web page [GlobalChange.gov]

Fourth National Climate Assessment

Reports [Reports Library]

U.S. EPA

Future Earth

NGOs, GOs, Universities, and Institutes