A deal appears to be in sight for the final day of the UN climate change talks, but there are fears it may not prevent a 3C (5.4F) temperature rise.
Denmark's prime minister spoke of "very fruitful" talks as Copenhagen prepared to receive US President Barack Obama and 118 other world leaders.
Both the US and China, the two largest emitters of greenhouse gases, have indicated they may make concessions.
It is hoped these may help overcome sharp divisions at the two-week talks.
China signalled concessions on the monitoring of emission curbs while the US said it would commit money for developing countries.