Results in Montreal

"If you want to talk about global consciousness, I'd say there's one country that is focused on action... dialogue... co-operation and... helping the developing world, and that's the United States," said state department spokesman Adam Ereli in Washington.

Despite the row, environmentalists said the conference had been in most respects a success, reaching agreements on how to quantify gas emissions and how to penalise nations for failing to meet Kyoto targets.

BBC has more here.