确立减排目标是所有实际问题中最具有挑战性的一个。
Setting mitigation targets is the most challenging practical element.
去年有关气候变化的哥本哈根会议实际上是把欧洲忽略掉了，尽管欧洲率先确立温室气体的减排目标。
The EU was virtually ignored at last year’s Copenhagen summit on climate change, even though it had taken the lead in setting targets to reduce greenhouse-gas emissions.
加州确立了CO2减排的死目标，其它州也纷纷准备效仿。
California now has binding targets to cut CO2 emissions, and other states plan to follow.
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