New York Times: Yvo de Boer`s resignation on Thursday after nearly four tumultuous years as chief steward of the United Nations` climate change negotiations has deepened a sense of pessimism about whether the world can ever get its act together on global warming. Mr. de Boer was plainly exhausted by endless bickering among nations and frustrated by the failure of December`s talks in Copenhagen to deliver the prize he had worked so hard for: a legally binding treaty committing nations to mandatory reductions …