United States President Barack Obama says people are justified in being disappointed by the outcome of the Copenhagen climate conference.
The BBC reports the comments followed criticism of the United States for its role at the summit.
In an interview on US PBS television's Newshour Mr Obama said that at least there had not been too much "backsliding" on previous positions.
He said this was preferable to a complete collapse of the talks.
The summit ended with an accord between the United States, China, India, Brazil and South Africa, but it is not legally binding.