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CO2 exceeds 400ppm anniversary
Date:
9th May
Description:
On May 9, 2013, an instrument near the summit of Mauna Loa in Hawaii recorded a long-awaited climate milestone: the amount of carbon dioxide in the atmosphere there had exceeded 400 parts per million (ppm) for the first time in 55 years of measurement—and probably more than 3 million years of Earth history.

https://www.nationalgeographic.org/news/climate-milestone-earths-co2-level-passes-400-ppm/
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