The UN climate chief said Wednesday the Copenhagen Accord was vague about climate funds pledged by rich countries to help poor countries fight against climate change.
''I do not see that funding being disbursed until we have decisions on how that money is to be managed and what it is to be for,'' said Yvo de Boer, the executive secretary of the UN Framework Convention on Climate Change (UNFCC).
That cannot happen until another round of U.N. negotiations, which so far is not due until next June, he said.
Extra meetings could be scheduled before then, however.
A total of 30 billion dollars was pledged by rich countries from 2010-2012 to help poor countries fight against climate change, and rich nations sketched a target of providing 100 billion dollars annually by 2020.
The Copenhagen deal was negotiated in marathon closed-door sessions during the final day of the two-week conference among a select group of less than 30 countries.
The three-page document was ''noted'' by the full conference after five countries blocked its formal adoption by consensus.
Since then, several countries at the center of the bargaining have distanced themselves from the accord.