Associated Press: 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 could pollute water above and below ground and deplete aquifers. As gas drillers swarm to this …