Yvo de Boer, executive secretary of the United Nations Framework Convention on Climate Change (UNFCCC), steps down, effective July 1.
Participants approved a Copenhagen accord that sets out emissions-control objectives, sets a target of less than 2 degrees for global warming, and pledges $30 billion in aid to developing countries. The pact is not legally binding.
As the Copenhagen global warming talks head into their final days, observers say many climate change issues are likely to be left unresolved.
A draft pact for a global warming treaty released Friday in Copenhagen would commit the US to significant emissions cuts by 2020 and draw developing nations into an agreement for the first time.
The Copenhagen climate change talks kicked off on Monday. A Q&A on the key areas that will define success or failure.
The Copenhagen global climate change summit began Monday with new urgency for a deal, and eyes on China and the US.
From a 2005 baseline, a 17 percent emissions cut would fall short of what's needed to keep global warming to 3.6 degrees F. But it may reflect most that US Senate would OK from climate talks.
The Copenhagen summit on climate change is looking less likely to produce a binding CO2 emissions reduction agreement as a new study finds that global carbon dioxide emissions increased 29 percent in the past nine years.
A European Union agreement last week was short on specifics. US commitments on reductions may not be forthcoming, making Chinese commitments also unlikely.
With little agreement at the Bangkok UN climate meeting of 180 nations, the agenda for the crucial December Copenhagen conference is still up for heated debate.