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There are 240 billion tons of coal left in the U.S. and 1.2 tons are mined out each year. If mining output increases by 1.8%
There are 240 billion tons of coal left in the U.S. and 1.2 tons are mined out each year. If mining output increases by 1.8% each year, how long will the U.S. coal reserves last?
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