US National Oceanic and Atmospheric Administration (NOAA)

The 2016 average global carbon dioxide concentration was 402.9 parts per million (ppm), an increase of 3.5 ppm compared with 2015 - Sakshi Post
Aug 11, 2017
The State of the Climate report, a sort of annual check-up for the planet, was compiled by NOAA researchers and had contributions from over 450 scientists from nearly 60 countries.
Back to Top