(NEWSER) – The big part of President Obama's climate-change strategy unveiled today was indeed his promise to put emissions limits for the first time on the nation's power plants. (See highlights of that and four other key points at the Week. Click for the full transcript of the speech or for the White House's own highlights). But the president also made headlines with his statement about the proposed Keystone oil pipeline: He promised to kill the project if studies showed it would "significantly" worsen greenhouse gas emissions. He did not, however, spell out what he means by "significantly," which helps explain why both "opponents and backers of the pipeline found support for their positions in his remarks," reports the New York Times.

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