May 1974 to the Present: Mauna Loa Observatory average CO2 record, maintained by NOAA.
The monthly values reflect the cyclical or seasonal changes in an inexorably upward secular trend. Check out the graph on the webpage cited below.
May 1974 to the Present: Mauna Loa Observatory average CO2 record, maintained by NOAA.
The monthly values reflect the cyclical or seasonal changes in an inexorably upward secular trend. Check out the graph on the webpage cited below.