November 18, 2014 1:15 PM EST

President Obama will have the chance to approve or veto the Keystone XL Pipeline, of which 40% has already been built, after the Senate takes a vote Tuesday.

Environmentalists argue that the pipeline will cause toxic oil spills and pollute water supplies, though an environmental impact review released by the State Department concluded that the pipeline will not result in a significant increase on greenhouse gases.

Here’s a by-the-numbers look at the project.

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