Photo: #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.
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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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Conservative group challenges the consensus on global warming

Broadcast: Midday, 03/12/2007, 12:06 p.m.

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Minnesota legislators heard testimony from scientists, religious leaders and even a polar explorer at an unusual joint committee hearing on global warming. What they didn't hear were any voices urging them not to pass laws to curb greenhouse gases. So on March 8, the American Property Coalition held its own conference: "What science really says about global warming."

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