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, 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 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.