WASHINGTON (AP) — President Barack Obama says that the proposed Keystone XL pipeline project from Canada to Texas should only be approved if it doesn't worsen carbon pollution.Obama says allowing the oil pipeline to be built requires a finding that doing so is in the nation's interest. He says that means determining that the pipeline does not contribute and "significantly exacerbate" emissions. Obama was speaking at Georgetown University on measures he intends to take to confront climate change. Environmental activists have demanded that the administration not approve the pipeline, which would carry oil from Canadian tar sands to the Texas Gulf Coast.

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