Barack Obama has thrown his weight behind a deal on climate change by announcing he will attend the Copenhagen summit with a pledge for a 17 per cent cut in US emissions.
巴拉克·奥巴马(Barack Obama)宣布将带着美国削减17%排放量的承诺，参加哥本哈根峰会，以此表示他支持达成气候变化协定。
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