From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'ratify', Sentence: 'While Canada has ratified the Kyoto Protocol with its legally binding limits on carbon dioxide emissions , some provincial agencies have gone their own way , choosing to support President George W. Bush 's Global Climate Change Initiative , which calls for an 18 percent reduction in U.S. greenhouse gas intensity by 2012 using voluntary means .'
ratified