Drip by drip, the full story is emerging of last December's global diplomatic debacle in Copenhagen, when instead of setting the world on a new low carbon path and tackling climate change, 130 world leaders ended up with a weak deal and no prospect of a binding agreement for another 18 months.
The latest revelations come from the man at the very heart of the debacle, UN climate chief Yvo de Boer. Normally the model of a discreet and guarded international bureaucrat, his confidential letter of explanation to his colleagues, written only days after the meeting ended, displays a mix of bemusement, clarity and exasperation. "How could several years of negotiation and high level diplomacy be allowed to end up this way?", he asks.
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