Environment
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In this Wednesday, Feb. 27, 2008, file photo, a new gas pipelines sit in a field near Illiopolis, Ill. America’s plan to use more natural gas to run power plants, make chemicals, drive vehicles and heat homes has been called into question by 2014's very tough winter. (AP Photo/Seth Perlman)
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Protesters demonstrated in opposition to the proposed Keystone XL oil pipeline, Monday, March 10, 2014, outside the Federal Building in Philadelphia. The protestors say the pipeline would contribute to global warming. (AP Photo/Matt Rourke)
