And now for that math.
现在我们来计算一下。
Man-made emissions of greenhouse gases since 1850 have raised global temperatures by about 0.8 degrees Celsius, notes Grantham. Once that number hits 2 degrees, we're in deep trouble on global warming.
格兰瑟姆指出,1850年以来,人为温室气体排放已经导致全球气温升高0.8摄氏度左右。气温值升高一旦达到二摄氏度,我们就会因全球变暖而陷入深重灾难。
How much greenhouse gas would we have to emit to hit 2 degrees? Grantham says science allows us to calculate the figure at 565 gigatons.
要排放多少温室气体才会导致气温升高二摄氏度呢?格兰瑟姆称,根据科学计算,这个值是5,650亿吨。
Yet the proven underground energy reserves of the oil, gas and coal industries, if used up, would emit 2,800 gigatons, or five times that level.
但如果石油、天然气和煤炭行业的已探明地下能源储量全部消耗完,温室气体排放量会达到28,000亿吨,相当于前述值的五倍。
So if the oil, gas and coal industries use up more than one fifth of their proven energy reserves - even ignoring further discoveries - we're into the red zone.
因此,如果石油、天然气和煤炭行业消耗五分之一以上的已探明能源储量(即使忽略新发现的储量),我们就会陷入危险的境地。
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