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Half the nation's electricity comes from coal plants, and most of them have expected operating lives beyond 10 years; replacing them would require massive capital investment and throw scores of big energy firms into turmoil. Moreover, solar and wind equipment manufacturers would be hard-pressed to supply enough wind turbines and solar panels to meet Gore's goals in a decade. Most major wind-turbine makers already have backlogs of more than a year for projects that will meet a relatively small portion of U.S. electricity needs.