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Protesters demonstrating in opposition to the proposed Keystone XL oil pipeline, Monday, March 10, 2014, block the door to the federal building in Philadelphia. The protesters say the pipeline would contribute to global warming. (AP Photo/Matt Rourke)
Photo by: Matt Rourke
Protesters demonstrating in opposition to the proposed Keystone XL oil pipeline, Monday, March 10, 2014, block the door to the federal building in Philadelphia. The protesters say the pipeline would contribute to global warming. (AP Photo/Matt Rourke)

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