国际能源署估计非欧佩克成员国内的成熟油田产量每年将自然下降11%。

The IEA estimates that the output from mature fields outside OPEC would naturally drop by about 11% a year.

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环保署自然会成为主要目标，至于奥巴马在此问题上的反击力度会有多大，目前尚不清楚。

The EPA will certainly be a prime target, and it's still unclear how hard Obama will fight back on this issue.

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根据联合国环境规划署的报告，较之碳储存，自然捕碳的方式更多，更好。

And according to a UNEP report, there are better natural ways to store carbon.

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