WASHINGTON The United States will pledge to cut its greenhouse gas emissions by 17 percent by 2020 at a U.N. climate change meeting in December, the White House said on Wednesday.
Obama's negotiating position for the talks in Copenhagen has been hampered by slow progress on a climate bill in the U.S. Senate.
The U.S. House of Representatives passed a bill that sets a 17 percent reduction target for emissions by 2020 from 2005 levels. A Senate version aims for a 20 percent cut.
The European Union is pressing for more aggressive cuts and has pledged a 20 percent drop in its emissions compared to 1990 levels.
(Reporting by Jeff Mason, editing by Ross Colvin and Sandra Maler)