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Hydraulic fracturing – or fracking – is a process used by energy companies to get natural gas out of the ground. Fracking involves forcing water, sand and chemicals underground to fracture rocks and release the natural gas trapped within them. But what happens to those chemicals once they’ve been injected into the ground?

That depends upon whom you ask. In a joint effort with ProPublica, the non-profit investigative journalist organization, Need to Know sent correspondent John Larson to Wyoming, where some residents believe fracking is contaminating their water and risking their health. Need to Know airs Fridays on PBS. Watch full-length episodes of Need to Know

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