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populations of vertebrate species have declined by 30 per cent since 1970, with 20 per cent of that loss attributable to the conversion and degradation of natural habitats.
自1970年以来,脊椎动物物种总数下降了30%,而这种丧失的20%是自然生境的转换和退化造成的。
over 50 per cent of the world's plant species and 42 per cent of all terrestrial vertebrate species are endemic to 34 biodiversity hotspots (see figure xxii).
世界上50%以上的植物物种和42%的所有陆栖脊椎动物物种为34个生物多样性热点地区所特有 (见图二十二)。
ever more species are threatened by extinction, including almost 20 per cent of vertebrate species (comprising birds, mammals, amphibians, reptiles and fish).
频临灭绝的物种空前多,包括几乎20%的脊椎动物(其中又包括鸟类、哺乳类、两栖类、爬行类鱼类)。