Today's coal-burning power plants are among the dirtiest sources of fossil fuel power. Gasification power plants-huge pressure cookers that convert coal into a stew of superheated gases that power a turbine-release fewer pollutants than conventional coal plants but still emit vast amounts of carbon dioxide, the leading cause of global warming. Research on cheap carbon dioxide removal, though, is gathering steam-and could make coal gasification a nearly zero-emission fossil fuel power source.

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