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Global CO2 Concentration

The Mona Loa observatory in Hawaii has been measuring atmospheric carbon dioxide concentrations since 1958. The NOAA now publishes the short summary depicted below.

Week of April 18 2021:	418.20 ppm
One year ago:	416.24 ppm
10 years ago:	393.63 ppm
Pre-industrial base:	280 ppm
Safe Level:	350 ppm

Last updated: May 1, 2021

© 2021 For Our Grandchildren

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