hitting 400ppm The Keeling Curve – A daily record of atmospheric carbon dioxide

http://keelingcurve.ucsd.edu/
from Scripps Institution of Oceanography at UC San Diego

Concentrations of the greenhouse gas carbon dioxide in the
global atmosphere are approaching 400 parts per million (ppm)
for the first time in human history

This website provides daily updates, analysis, and information
on the state of climate.

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