AMSTERDAM (AP) — Negotiators from the world's 17 biggest polluters meet in London tomorrow to try to break through a deadlock in discussions on an international climate change treaty.

Pressure is mounting on the U.S. to figure out where it stands after the Obama administration argued its decisions are being held up by a slow-moving Congress.

Britain's environment minister says the Americans must come to the December meeting in Copenhagen "with a clear sense of what they want to do."

The conference is meant to cap two years of negotiations on the treaty, but pessimism is mounting that a deal can be struck without policy changes at the highest level. A U.N. official writes on Newsweek's Web site that "the prospects that states will actually agree to anything in Copenhagen are starting to look worse and worse."

President Barack Obama initiated tomorrow's confidential talks to quietly deal with the toughest problems.

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Peter Krause (KROW'-zuh), correspondent

The world's 17 biggest and most polluting nations meet in London on Sunday to discuss global warming. Correspondent Peter Krause reports.

<> 00:13 "managing the funds"

Peter Krause (KROW'-zuh), correspondent

Correspondent Peter Krause reports negotiators have failed to agree on how to finance efforts to contain climate change.