Wallace S. Broecker, in Natural History (Oct. 1987). American Mu- seum of ~atural History, central Park West at 79th St., New York, N.Y. 10024.
The "greenhouse effecto-the rise in the Earth's surface temperature caused increasing amounts of carbon dioxide, methane, and freon gases in the environment-is well known. But what will the consequences be in the long term?
Broecker, a geologist at Columbia University, believes that increasing amounts of "greenhouse" gases may cause shifts...