Shale

***BESTPIX*** Fracking In California Under Spotlight As Some Local Municipalities Issue Bans

David McNew/Getty Images

A burrowing owl stands next to its burrow near pump jacks in an oil field over the Monterey Shale formation where gas and oil extraction using hydraulic fracturing, or fracking, is on the verge of a boom.

A woman walks past a graffiti covered caravan at a protest camp set up close to the entrance of the IGas exploratory gas drilling site at Barton Moss, near Manchester...A woman walks past a graffiti covered caravan at a protest camp set up close to the entrance of the IGas exploratory gas drilling site at Barton Moss, near Manchester, northern England, March 6, 2014. Britain may be a prime location for shale gas exploration in Europe, but a lack of onshore drilling infrastructure and local opposition will impede development, experts and geologists said at a shale conference in London.

Phil Noble/Reuters

A woman walks past a graffiti covered caravan at a protest camp set up close to the entrance of the IGas exploratory gas drilling site at Barton Moss, near Manchester, northern England. Britain may be a prime location for shale gas exploration in Europe, but a lack of onshore drilling infrastructure and local opposition will impede development, experts and geologists said at a shale conference in London.

A demonstrator stands in the road as police escort a lorry to a site run by Cuadrilla Resources outside the village of Balcombe in southern England...A demonstrator holds a sign that reads "Safe Fracking Is A Bad Fairy Tale" as police escort a lorry to a site run by Cuadrilla Resources, outside the village of Balcombe in southern England August 6, 2013. Protesters have been blocking access to a drilling site in southern England as part of a campaign against the controversial "fracking" process used in shale gas exploration, illustrating the potential battle ahead for Britain's nascent shale industry. REUTERS/Luke MacGregor (BRITAIN - Tags: BUSINESS ENERGY POLITICS ENVIRONMENT)

Luke MacGregor/Reuters

A demonstrator holds an anti-fracking sign as police escort a lorry to a drilling site run by Cuadrilla Resources, outside the village of Balcombe in southeast England on Tuesday. Protesters have been blocking access to the site as part of a campaign against the fracking process used in shale gas exploration.