History

14 March, 10:37

What is "clean coal"?

A.

coal that is first washed and purified before being shipped for use in power plants

B.

coal that is burned with technology that cuts the amount of soot and sulfur dioxide emitted

C.

coal that is mined underground with minimum impact on the surface environment

D.

coal mined in certain regions of the country from veins that are free from impurities

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