But he indicated that Copenhagen most likely won't produce a treaty, but instead will push governments as far as they can go on the content of an agreement.

"The secretary-general believes that we must maintain the political momentum established by the 101 heads of state and government who attended the climate change summit and continue to aim for an ambitious, politically binding agreement in Copenhagen that would chart the way for future post-Copenhagen negotiations that lead to a legally binding global agreement," Pasztor said.