Levels of the gas at the Zeppelin research station on Svalbard, northern Norway, last week peaked at over 397 parts per million (PPM), an increase of more than 2.5ppm on 2008.

挪威北部斯瓦尔巴群岛上的齐柏林研究站上周记录的二氧化碳气体水平最高值超过397个百万分点，比2008年的水平增加了2.5个百万分点。

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Atmospheric concentrations of carbon dioxide have reached 386 parts per million-and rising, because every year, human activity spews more than 30 billion metric tons of CO2.

目前大气中CO2(二氧化碳)的浓度已达百万分之386，而且还在上升。因为每年，人类活动要排放出300多亿吨CO2。

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California requires that products that contain more than 30 parts per million of 1, 4-dioxane carry a warning saying that the contents may cause cancer.

加利福尼亚州要求的产品中含有了超过百万分之30的1,4 -二恶烷是应该有警示说此产品中含有可能会引发癌症的物质。

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And sure enough, Mathur found that among the nearly 800 participants she tested, those with higher levels of methane (three or more parts per million over 90 minutes) and hydrogen gases (20 or more parts per million) in their breath also tended to be heavier, with a BMI about 2.4 points greater than those with normal levels of the gases and about 6% more body fat on average.

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Stopping the increase at 450 parts per million when the climate is generally expected to be no more than two degrees warmer than in pre-industrial times is the world's ambition.

ECONOMIST: Energy