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We did not break 400 ppm after all, but does it matter?
The LA Times reports, “Carbon dioxide in atmosphere did not break 400 ppm at Hawaii site.” They note:
“The National Oceanic and Atmospheric Administration (NOAA) revised its May 9 reading at the Mauna Loa observatory in Hawaii, saying it remained fractions of a point below the level of 400 ppm, at 399.89.”
The measurement stayed just under the 400 ppm mark! Do we breath a sigh of relief? Did we dodge a bullet? I mean, for the last 800,000 years we have never broken the 300 ppm level, so I am not sure that the revised measurement really makes me feel all that much better…
We have reached a new record. For the first time in 800,000 years the atmospheric levels of carbon dioxide have reach 400 parts per million. For 1000s of years, the atmosphere has remained under 300 ppm of carbon dioxide. We were around 315 ppm in 1960. The rate of growth continues to grow.