IS the new boom in domestic natural gas production an economic bonanza or environmental disaster?

Is the new boom in domestic natural gas production an economic bonanza or environmental disaster?
(Phys.org)—For some Americans, it is our energy dreams come true. To others, it is an environmental nightmare. Ever since a new drilling technology, called hydraulic fracturing or fracking, made it possible to extract natural gas from shale deposits about a mile underground, a new gold rush has been under way. http://phys.org/news/2012-12-boom-domestic-natural-gas-production.html#nwlt