Studies Say Natural Gas Has Its Own Environmental Problems

Two studies that planet-warming methane, the chief component of natural gas, is being released in large amounts into the atmosphere at drilling sites throughout the country. The rush to drill for natural gas and the adoption of hydrofracking have also resulted in contamination of rivers and water supplies with toxins and radioactive elements. 
http://www.nytimes.com/2011/04/12/business/energy-environment/12gas.html?partner=rss&emc=rss