Fracking is is where we get half our gas.

The natural gas industry has been getting some bad press, focused on its use of hydraulic fracturing in producing natural gas from shales.  Fracking, as it's called, is considered a revolutionary technology, in a good way.

Wikipedia says 

Shale gas is natural gas produced from shale. Shale gas has become an increasingly important source of natural gas in the United States over the past decade, and interest has spread to potential gas shales in Canada, Europe, Asia, and Australia. One analyst expects shale gas to supply as much as half the natural gas production in North America by 2020.^[1]

^{But the movie "Gasland" which got raves at Sundance Festival makes a case for abandoning it.  (It's a documentary that features a man  IGNITING HIS KITCHEN TAP , and other scary things, including an EPA employee complaining about EPA studies that were postponed. ). It is on YouTube: http://www.youtube.com/watch?v=phCibwj396I&NR=1}

The oil and gas industry has put out a slick rebuttal,--the Truth About Gasland-- which you can also see on You-tube: http://bit.ly/f6RjSj