的记录772..数十万年来773.Theconcentrationofcarbondioxide...二氧化碳的浓度从未这样高774.hasn'tbeensohighforseveralhundredthousandyears.人类从未生活在这种大气下775.Humanityhasneverlivedinanatmospherelikethis.资源的过度开发正威胁所有品种的生存?776.Isexcessiveexploitationofourresourcesthreateningthelivesofeveryspecies?气候变化使危机加深777.entuatesthethreat.到2050年,地球上四分之一物种778.By2050,aquarteroftheEarth'sspecies...面临绝种的危险779.couldbethreatenedwithextinction.在南北两极,大自然的平衡已瓦解780.Inthesepolarregions,thebalanceofnaturehasalreadybeendisrupted.格陵兰岛的沿海,冰山越来越多781.OffthecoastofGreenland,therearemoreandmoreicebergs.在北极圈,三十年来782.AroundtheNorthPole,theicecaphaslost...冰冠面积减少了30%783.30%ofitssurfaceareain30years.但当格陵兰岛迅速变暖784.eswarmer,一整个大陆的淡水785.thefreshwaterofawholecontinent...注入海中咸水786.flowsintothesaltwateroftheoceans.格陵兰岛的冰储存地球上20%的淡水787.Greenland'sicecontains20%.
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