1965: American Petroleum Institute President Admits CO2 Warming

Frank Ikard, American Petroleum Institute president, said this at API’s annual meeting in 1965:

"CO2 is being added to atmosphere by the burning of [fossil fuels] at such a rate that by 2000 the heat balance will be so modified as possibly to cause marked changes in climate beyond local or national efforts."

from: “Early oil industry knowledge of CO2 and global warming,” Benjamin Franta, Nature Climate Change (2018).
https://www.nature.com/articles/s41558-018-0349-9