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Conservative group challenges the consensus on global warming

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Air pollution
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
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Air pollution
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
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