showed that if global emissions do not peak and begin to fall by 2020, keeping the global average temperature rise since pre-industrial times below 2C will be difficult.

《自然—气候变化》期刊周末发表的一项研究表明，如果全球排放到2020年没有达到峰值并开始下降，将很难使全球平均气温自前工业时代以来上升幅度保持在2度以内。

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The increase of AP specific surface area lead to decrease of initial decomposition temperature, decomposition peak temperature and decomposition activation energy, but reaction rate constant rise.

AP比表面积的增大会导致推进剂初始分解温度、高低温热分解峰温和高低温下分解反应活化能的降低，但分解反应速度常数随AP比表面积的增大而增大。

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The rate of greenhouse gas emissions is rising and we're rapidly approaching the date by which science suggests they need to peak if there's to be a reasonable chance of keeping the temperature rise under 2C.

BBC: Durban: Climate summit looks back and forward