"It is physically impossible under any scenario to complete every detail of a treaty in Copenhagen," said Yvo de Boer, executive director of the UN Framework Convention on Climate Change (UNFCCC).
"But Copenhagen can and must agree to the political essentials that will make a long-term response to climate change clear, possible, realistic and well defined.”
De Boer added that Copenhagen must mark the end of the negotiation phase and the beginning of a “technical process to work out all the details.”
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