The White House says President Barack Obama will attend next month's climate change summit in Copenhagen,Denmark, and will make a provisional pledge to cut U.S.greenhouse gas emissions by 17 percent from 2005 levels by 2020.
VOA: standard.2009.11.26
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Backers of the program say its mere existence is a sign of progress, with firms that usually are competitors coming together to makeapledge they will need each other to meet.