Steam and exhaust rise up from the smokestack of a coal-burning electric power plant. Coal is blamed by environmentalists as a leading source for carbon dioxide, one of the three main gases causing the "greenhouse effect" and warming the earth's temperature. (Photo by Sean Gallup/Getty Images)
Gingrich, Kerry debate global warming
The debate over global warming, and what, if anything, to do about it, gets a fresh take Tuesday, as two national politicians debate the issue. Republican Former House Speaker Newt Gingrich and Democratic Sen. John Kerry face off at a debate sponsored by New York University.
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