Congratulations, World! Atmospheric CO2 Levels Have Not Been This High in the Past Three Million Years
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 …