Obama on Keystone: "I'm going to evaluate this based on whether or not this is going to significantly contribute to carbon [sic] in our atmosphere"

Interview With President Obama - NYTimes.com

I meant what I said; I'm going to evaluate this based on whether or not this is going to significantly contribute to carbon [sic] in our atmosphere. And there is no doubt that Canada at the source in those tar sands could potentially be doing more to mitigate carbon release.