连一些积极的自然资源保护论者都承认,随着人口的膨胀、消耗更多的自然资源、引起气候的变化,以及造成大量害虫和捕食动物的迁移等,地球上的生物多样性肯定不会完全地持续下去。许多专家的争论焦点已经转到了一个令人不安的话题,假使一些损失是不可避免的,多大程度的损失是可以容忍的呢?关于这个问题的辩论在局部和全球范围两个层面上同时展开:生态系统的一小部分可以小到何种程度仍能维持其完整、丰富的功能,从而可 Even some active natural resource conservationists admit that as the population expands, consumes more natural resources, causes climate change, and causes a great deal of pest and predator migration, the biodiversity on earth will certainly not Completely continues. The focus of debate among many experts has shifted to a disturbing topic. If some losses are unavoidable and to what extent the losses can be tolerated, the debate on this issue will be carried out simultaneously on both the local and global levels: A small part of the ecosystem can be as small as it can still maintain its complete and rich functionality.