Exxon predicted in 1982 exactly how high global carbon emissions would be today
Measurements taken on May 3 at the world’s oldest measuring station, the Mauna Loa Observatory in Hawaii, recorded “humanity’s first day ever with more than 415 parts per million [ppm] CO2 in the air,” according to the United Nation’s climate change Twitter account. As of May 12, levels have remained steady at 415 ppm.
Never before in human history has there been so much carbon dioxide in the atmosphere. The last time scientists believe it may have been this high was 2.5 to 5 million years ago during the Pliocene epoch, when sea levels were 25 meters higher than today and global temperatures were warmer by 2-3 degrees Celsius.
According to an internal 1982 document from Exxon Research and Engineering Company — obtained by InsideClimate News as part of its 2015 investigation into what Exxon knew about the impact of fossil fuels on climate change — the company was modeling out the concentration of carbon emissions several years into the future.