全球气候问题转趋严重,反常天气时有发生。多位科学家近日表示,目前大气中的二氧化碳浓度,已经达到百万分之400(400ppm),创下300万年以来新高。他们警告浓度一旦持续,未来数百年的温度及水位将会大幅上升。
德国波茨坦气候影响研究中心的研究员维莱希奇说,地球目前的二氧化碳浓度,与上新世晚期(即距今约530万年至260万年前)比较接近。根据该研究中心的气候模型显示,由于二氧化碳浓度太高,气候太过温暖,当时北半球并未出现大面积的冰层。
地球上一次二氧化碳浓度达到400ppm时,丹麦属地格陵兰仍未冰冻,南极洲的边缘大陆甚至有树木生长,当时的水位较现时深至少15米。
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