The Trump administration has approved a construction permit on the long-delayed Keystone XL pipeline. Back when it was planned in 2010, oil was still trading at $100 a barrel and fracking had yet to fully ramp up. The project still serves as a symbol for both environmentalists and energy companies. But the overall impact of the pipeline may be less than originally thought, both in environmental terms and its demand from a market that is already flush with supply.

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