Why America finally woke up to climate change threat

The turning point, history may record, was the duck moment. It was around midnight on Thursday at the crucial United Nations climate talks in Montreal, Canada, when the chief United States negotiator, Harlan Watson, threw a wobbly. Fearing that a Canadian proposal for an international dialogue on combating global warming was really a covert attempt to drag the US into binding negotiations, he walked out. But not before making the memorable retort:
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