How Long Have We Known About This?

Roger Revelle

Hans Suess

In 1957 two California scientists, Roger Revelle and Hans Suess wrote “Human beings are now carrying out a large-scale geophysical experiment.”  They said humans are returning to the atmosphere carbon that has been stored in the ground over hundreds of millions of years.

Bert Bolin

In 1959 the New York Times reported on the annual meeting of the US National Academy of Sciences where a Swedish scientist Bert Bolin presented a paper indicating “that within 40 years the amount of carbon dioxide in the air may have increased from 25% to 30%.” He was right. He went on to predict that the effect on climate might be radical.