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

WASHINGTON – Building the Keystone XL pipeline could lead to as much as four times more greenhouse gas emissions than the State Department has estimated, according to a study published in the journal Nature Climate Change that uses 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 controversial project proceed only if “it does not significantly exacerbate the problem of carbon pollution.”
The study’s authors based their calculations on the premise that ...

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