Nuclear power plants like this one in Middletown, Pa., currently supply 20 percent of the nation's electricity. Some legislators want them to provide more, but it's turning into quite a sticky subject.
Coal-fueled power stations like this one in Warrington, United Kingdom, are said to be contributing to global warming. But e-mail messages stolen from a group of climate scientists recently are fodder for skeptics who say global warming is a plot, not a real problem.
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