A drilling rig operating in an oil and gas field in Weld County, Colorado. It is one of scores of rigs that travel to different locations to drill into the shale rock, soon followed by pumps that inject a toxic brew of water and chemicals for hydraulic extraction or 'fracking' of oil and gas. A boom in drilling across the American West has led to pollution and environmental problems in what were once pristine lands. Photograph by Roger M. Richards
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