In the world of environmental activism there is a good rule of thumb. If an energy source comes out of the ground, it is probably bad (think coal, oil, natural gas and, in the view of many, uranium). If it does not, then it is probably good (think wind, wave and solar power). But there is an exception. Even the most hair-shirted environmentalist finds it hard to argue against geothermal energy. When what comes out of the ground is merely hot water or steam there is, as it were, little to get steamed up about.
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