Boston Globe: THE BEST way to cut down on the greenhouse gases produced by power generation is to reduce the nation’s appetite for electricity. Renewable energy sources like wind power and biomass have a helpful role to play. Yet, dependable base sources will remain necessary, and coal-fired plants will probably be part of the mix for a long time. Minimizing the impact of such plants is vital. That is why it is so discouraging that the Bush administration pulled the plug on a pilot project for using coal …