Special Message to the Congress on Conservation and Restoration of Natural Beauty
February 8, 1965
Johnson's remarks arose from a 1965 report to his Administration, “Restoring the Quality of Our Environment,” by the Environmental Pollution Panel of the President’s Science Advisory Committee, which had a chapter on CO2’s potential to cause warming.
A 1963 report by the Conservation Foundation, "Implications of Rising Carbon Dioxide Content of the Atmosphere," had warned that the doubling of CO2 projected for the next century could raise the world's temperature by 4°C. [Weart, p. 44].