Year in Review
FILE – In this April 23, 2010 file photo, workers move a section of well casing into place at a Chesapeake Energy natural gas well site near Burlington, Pa., in Bradford County. So vast is the wealth of natural gas locked into dense rock deep beneath Pennsylvania, New York, West Virginia and Ohio that some geologists estimate it’s enough to supply the entire East Coast for 50 years. But freeing it requires a powerful drilling process called hydraulic fracturing or “fracking,”using millions of gallons of water brewed with toxic chemicals that some fear threaten to pollute water above and below ground, deplete aquifers and perhaps endanger human health and the environment. (AP Photo/Ralph Wilson, File)