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400ppm

400ppm

400ppm

400ppm

1

Scientific judgments put the "safe " level between 400 and 550 ppm with the consensus shifting towards the lower end of that range .

科学判断将 “安全 ”水平定在 400ppm 至 550ppm 之间，人们普遍倾向于这一范围的下限。

2

With atmospheric carbon concentrations rising towards 400 parts per million concerns about climate change will not go away .

随着大气中的碳浓度接近 400ppm ，人们对于气候变化的担忧将不会消失。

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