The sun sets in Zamboanga City in the southern Philippines Saturday, February 6, 2010. The local electric cooperative says there is a plan to put up a coal-fired power plant in Zamboanga City. Coal-fired units produce electricity by burning coal in a boiler to heat water to produce steam. The steam, at tremendous pressure, flows into a turbine, which spins a generator to produce electricity. The steam is cooled, condensed back into water, and returned to the boiler to start the process over. But environmentalists say the coal-fueled plants will pollute the air and contribute to global warming. (Mindanao Examiner Photo)
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