Coal is an important domestic energy source, and BLM is responsible for managing coal resources on about 570 million acres of federal, state, and private land. Since 1990, all federal coal leasing has taken place through a lease-by-application process where companies propose lease tracts to be put up for sale by BLM. In fiscal year 2012, about 1.05 billion tons of coal was produced in the United States, including production from federal coal leases, and the biggest coal production area for federal coal was the Powder River Basin in northeast Wyoming and southeast Montana. Coal is also an important fuel source worldwide and consumption of coal continues to increase. To meet this growing demand, there has been an increase in global trade of coal, including exports from the United States.