The amount of natural gas, in cubic feet, that the U.S. Energy Department estimates is in the Marcellus Shale -- down from 410 trillion cubic feet last year. Gas production in the region doubled in 2011.
The amount of natural gas, in cubic feet, that the U.S. Energy Department estimates is in the Marcellus Shale -- down from 410 trillion cubic feet last year. Gas production in the region doubled in 2011.