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President-elect Barack Obama pauses during his meeting with Sen. John McCain, R-Ariz., not shown, Monday, Nov. 17, 2008, at his transition office in downtown Chicago. (AP Photo/Pablo Martinez Monsivais)AP - Calling climate change an urgent challenge, President-elect Barack Obama promised Tuesday that Washington would take a leading role in combating it in the United States and throughout the world. “My presidency will mark a new chapter in America’s leadership on climate change,” Obama said in a video message to governors and others attending a Los Angeles summit on the issue.