President Donald Trump on Tuesday signed four executive orders designed to boost the U.S. coal industry, outlining steps to protect coal-fired power plants and expedite leases for coal mining on U.S.

The days of tossing another lump on the fire to keep warm are behind most of us, but coal is still vital to keep our modern computers, air conditioners, and even cars humming. How much do you know ...

—There are an estimated 275 billion tons of recoverable coal reserves in the United States, or about one-fourth of the world’s total. The energy content of U.S. coal reserves is four times greater ...