| http://www.w3.org/ns/prov#value | - Carbon dioxide is the chief man-made global warming gas.Energy Department economist Perry Lindstrom said carbon pollution reduction is due to warm winter weather, more efficient cars because of new mileage requirements and an ongoing shift from coal-power to natural gas to produce electricity.The coal shift is a big factor as is a sluggish economic recovery, said Jay Apt, director of the Carnegie
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