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四十年后,喜马拉雅山的冰河可能消失;五十年内,格陵兰岛的冰层可能全部融化;本世纪末,拥有地球半数生物种类的亚马逊雨林可能变成热带草原。全球气温每升高一度,都将使地球出现剧烈变化。而改变世界,只需要六度。