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Natural gas produced in the Marcellus Shale gas basin in Pennsylvania and New York is not as big a contributor to climate change as coal, according to a study of the "life cycle" greenhouse gas emissions of natural gas by researchers in Pittsburgh.

Once considered a trend , environmentalism has established itself as permanent and profitable. "Environmental consulting is a mature business now," says Brad Mauer, business development manager for Sovereign Consulting Inc., an environmental consulting firm based in Robbinsville, New Jersey