AMSTERDAM (AP) - Top U.N. climate change official Yvo de Boer told The Associated Press on Thursday that he was resigning after nearly four years, a period when governments struggled without success to agree on a new global warming deal.
His departure takes effect July 1, five months before 193 nations are due to reconvene in Mexico for another attempt to reach a binding worldwide accord on controlling greenhouse gases. De Boer's resignation adds to the uncertainty that a full treaty can be finalized there.
De Boer is known to be deeply disappointed with the outcome of the last summit in Copenhagen, which drew 120 world leaders but failed to reach more than a vague promise by several countries to limit carbon emissions - and even that deal fell short of consensus.
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