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550ppm

550ppm

550ppm

550ppm

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

A commonly cited goal is to stabilize GHG concentrations around 450-550 parts per million (ppm), or about twice pre-industrial levels .

一个共同的目标是使温室气体在空气中的浓度稳定在 450-550ppm （注二），或者大约两倍于工业化前的水平。

3

The IPCC reckons that stabilising at 550ppm would knock around 0 . 1% off global economic growth annually.

IPCC 认为，每年牺牲大约全球经济增长的 0.1%即可将 CO2 维持在 550ppm 的水平上。

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