Climate Central: President Obama announced Friday morning that he has denied TransCanadas permit application to build the Keystone XL oil pipeline in the U.S. The State Department has decided that the Keystone XL pipeline would not serve the national interest of the United States, Obama said. I agree with that decision. Obama said America is a global leader on taking action on climate change, and approving Keystone XL would have undercut that leadership. Some crude oil needs to be left in the ground to keep...