NATIONAL  ·   April 21, 2014

The Keystone XL pipeline, explained

- The first thing to know about the Keystone pipeline? It already exists. Here's a breakdown of the pipeline's various parts. ()

- The first thing to know about the Keystone pipeline? It already exists. Here's a breakdown of the pipeline's various parts. ()

The Keystone XL pipeline, explained (2:36)

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