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英语翻译If there was no natural greenhouse effect ,the average s

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英语翻译
If there was no natural greenhouse effect ,the average surface temperature would be about 34c colder than it is today.
If current trend in emissions were to continue,the amount of carbon dioxide in the atmosphere would double during the twenty first century with further increases thereafter.the amounts of several other greenhouse gases would increase substantially as well.
Because most greenhouse gases remain in the atmosphere for a long period of time,even if emissions from human activities were to stop immediately,effects of past emissions would persist for centuries.
1.如果没有天然温室效应的存在,那么如今地表的平均气温将会比现在低34摄氏度左右.
2.若现今排放废气的趋势继续下去,大气层中的二氧化碳将会在21世纪增加一倍,并将在之后继续增长.二另外几种温室气体也将会大量地增加.
3.因为大部分的温室气体会在相当久的一段时间内继续存在于大气层中,所以即使人类即刻停止排放废气,以往排放的气体所造成的后果将会延续几个世纪.