When George Bush proclaimed himself the environmentalist candidate in an outdoor campaign speech on Aug. 31, 1988, he had to mop his brow several times as he spoke. Last year was the hottest ever recorded, spurring a debate among scientists as to whether the mercury was registering proof of the "greenhouse effect." Carbon dioxide and other chemicals are spewed into the atmosphere by the burning of fossil fuels like coal and gasoline; the gases trap radiation that has come from the sun and that would otherwise escape into space. The result is global warming: over time, sea levels will rise, droughts...
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