然而向新型复制因子的这种转移可能会是一个危险的临界点。

Yet this shift to a new replicator may be a dangerous tipping point.

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现在存有一大未知数，即到达导致气候进一步变暖的危险临界点时的情形——比如储存在北极甲烷水合物被释放出来。

One big unknown is the stage at which dangerous tipping points would be reached that lead to further warming - for example the release of methane hydrate deposits in the Arctic.

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研究发现，受BP漏油事故影响且经FDA检测的虾类产品中有大约50%产品的有害碳物质含量超出了该组织视为对怀孕妇女安全构成危险的控制临界值。

The study found about 50 percent of the shrimp the FDA tested after the BP spill had harmful carbon levels exceeding the level of risk deemed by the group to be safe for pregnant women.

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