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Five of Keystone XL's biggest critics Add to ...

TransCanada Corp.'s proposed Keystone XL pipeline – which would pump Alberta crude oil to refineries on the U.S. Gulf Coast – has inspired no shortage of debate from public figures. Some of them are urging U.S. President Barack Obama to reject the proposal, claiming that Keystone will increase carbon emissions and thereby contribute to global warming. Here are five of Keystone's fiercest critics, all of whom are trying to shift public opinion as the U.S. edges closer to its decision.

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