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Keystone XL could mean more carbon emissions than estimated, study says
Keystone XL could mean more carbon emissions than estimated, study says

Building the Keystone XL pipeline could lead to as much as four times more greenhouse gas emissions than the State Department has estimated for the controversial project, according to a new study published in Nature Climate Change that relies on different calculations about oil consumption.  Emissions of heat-trapping carbon dioxide became central to the Obama administration’s review of a federal permit for Keystone XL, after the president announced in June 2013 that he would let the project proceed only if “it does not significantly exacerbate the problem of carbon pollution.” The study’s authors based their calculation on the premise that increased supplies...

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