January, 2013

The Silver Anniversary Of 350

January 21, 2013 glenn Uncategorized

Congratulations, World!  Twenty-five years ago, according to annual mean CO2 data from Mauna Loa Observatory, the earth’s atmosphere achieved the milestone, and threshold, 350 ppm CO2 level. In the last 25 years, the level has continued to climb.  It is now approximately 395 ppm.  It used to be below 300 a century and a half ago. This […]



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