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Using municipal waste to produce energy or reduce pollution is not an unusual practice. Landfill operators siphon off methane gas that is given off by decomposing organic trash. Incinerators burn garbage to produce steam that turns a turbine that makes electricity. Ze-gen's plant, currently under construction, is an attempt to demonstrate that different technologies--in this case gasification--can be used to convert waste to energy in a cost-effective and less polluting way.