In a 1965 speech to members, American Petroleum Institute president Frank Ikard outlined the findings of a report by then-president Lyndon Johnson’s Science Advisory Committee, based in part on research the institute conducted in the 1950s.
“The substance of the report is that there is still time to save the world's peoples from the catastrophic consequence of pollution, but time is running out,” Ikard said, adding, “One of the most important predictions of the report is that carbon dioxide is being added to the earth’s atmosphere by the burning of coal, oil, and natural gas at such a rate that by the year 2000 the heat balance will be so modified as possibly to cause marked changes in climate beyond local or even national efforts.”
Many scientists were reaching similar conclusions, based on a body of evidence that had been growing at least since French mathematician Joseph Fourier described the greenhouse effect in 1824. In the 1950s, Russian climatologist Mikhail Budyko examined how feedback loops amplify human influences on the climate. He published two books, in 1961 and 1962, warning that growing energy use will warm the planet and cause Arctic ice to disappear, creating feedback cycles that would accelerate warming.