Five ports in Washington and Oregon are considering building export terminals to ship coal to Asia, the coal would come from Wyoming and Montana and be shipped to the Northwest via train. Wyoming has 42 billion tons of reserve recoverable coal, and 1.4 trillion tons total that could become a reserve in the future. Most of the coal from Wyoming is sub-bituminous coal which burns at around 8400–8800 BTUs per pound. The sulphur content of Wyoming coal is quite low, which is important since sulphur dioxide emissions cause acid rain.
