This past week, atmospheric carbon dioxide levels passed a new ominous milestone.
Clocking in at 410.7 parts per million at the Mauna Loa Observatory, this key heat trapping gas hit a range not seen on Earth for many millions of years.
(The world crossed the 410 part per million milestone in the daily measure this week. Image source: The Keeling Curve.)
These levels now correspond with the Miocene Climate Epoch when seas were 120 to 190 feet higher than today and when global temperatures ranged from 3 to 5 degrees Celsius hotter than preindustrial averages.
Record Rates of Accumulation
These new records come following two years of record rates of atmospheric CO2 accumulation. According to NOAA, carbon dioxide accumulated by 3.03 parts per million during 2015 and by 3.00 parts per million during 2016. These now represent the two fastest rates of carbon dioxide accumulation in…
View original post 879 more words