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The Trump administration is pushing forward on plans for two major oil pipelines in the U.S., projects that sparked nationwide demonstrations and legal fights under President Obama.

President Trump on Tuesday gave the go-ahead for construction of two controversial oil pipelines, the Keystone XL and the Dakota Access.

As he signed the paperwork in an Oval Office photo op, Trump said his administration is "going to renegotiate some of the terms" of the Keystone project, which would carry crude oil from the tar sands of western Canada and connect to an existing pipeline to the Gulf Coast.

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At the Pulmonary Rehabilitation Clinic in Scarbro, W.Va., oxygen tubes dangle from the noses of three miners slowly pedaling on stationary bikes. All of these men have black lung — a disease caused by breathing in coal dust. Over time, the dust coats the lungs and causes them to harden. Hard lungs don't easily expand and contract, and that makes it difficult to breathe.

Researchers have long been confused by what seems like a paradox: many people in America vote against their economic self-interests. Whether it's the working class conservative who wants a tax cut for the wealthy, or a member of the liberal elite who fights for safety nets that raise his own taxes — we don't always act in the way that would help us the most.

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