Matthew Wolfe, an energy developer with plans to turn tree branches and other woody debris into electric power, sees himself as a positive force in the effort to wean his state off of planet-warming fossil fuels. "It's way better than coal," Mr. Wolfesaid, "if you look at it over its life cycle." Not everyone agrees, as evidenced by lawn signs in this nothwestern Massachusetts town reading "Biomass? No Thanks."
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