The world set a new record in May 2019, at least on a human perspective. Atmospheric concentrations of CO2 reached 415.26 ppm on May 14, as recorded at the Mauna Loa Observatory in Hawaii, a level not seen in the past three million years.
To put that into perspective, the last time atmospheric concentrations of CO2 were this high, there were no humans on Earth. This was the Pliocene Epoch, where global temperatures were on average 2-3°C (3.6-5.8°F) higher than today; the …
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