Today is the Highest Concentration of Atmospheric CO2 in Human History. 415 Parts Per Million. Last Time it Was This High, There Were Trees at the South Pole.
Think about this for a minute: We humans and our emissions are helping turn back the climatological clock by 2 or 3 million years, possibly more. Not since that time, called the Pliocene Epoch, has the CO2 ppm risen above 400.
Read More: https://www.universetoday.com/142221/today-is-the-highest-concentration-of-atmospheric-co2-in-human-history-415-parts-per-million-last-time-it-was-this-high-there-were-trees-at-the-south-pole/