STUDY FINDS WARMING TREND THAT COULD RAISE SEA LEVELS
By WALTER SULLIVAN
Published: August 22, 1981
In their analysis, the scientists seek to respond to an outspoken skeptic regarding the carbon dioxide threat, Dr. Sherwood B. Idso, a climate specialist with the Federal Department of Agriculture in Phoenix. Last March he circulated an analysis saying that a doubling or tripling of atmospheric carbon dioxide would have little effect except to increase global agricultural productivity by 20 to 50 percent.
Dr. Hansen and his colleagues cite the observed surface temperatures of Mars and, particularly, Venus as support for their predicted greenhouse effect. The surface of Venus, with an atmosphere formed largely of carbon dioxide, is at about 900 degrees Fahrenheit.
Both Mars and Venus have 95% CO2 atmospheres. Venus is hot because of the high atmospheric pressure, not because of the CO2.