Environment: Cleaning Up Coal Smoke

Though the U.S. is running short of oil and natural gas, it has enough coal to last for hundreds of years. But environmental laws forbid burning much of the nation's available coal because it contains large quantities of sulfur. When the high-sulfur coal is burned, it gives off sulfur dioxide (SO2), an invisible gas that kills plants, corrodes metals and injures human health.

Now General Motors reports a new process that reduces SO2 emissions by 90%. Tested successfully for 14 months in a pilot installation at the Chevrolet plant in Parma, Ohio, GM's process...

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