生物多樣性英語作文?

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一篇關於環保的英語短文

How Much Nature Is Enough?

By Andrew C.Revkin

Even some ardent conservationists acknowledge that the diversity of life on Earth cannot be fully sustained as human populations expand? use more resources? nudge the climate and move weedlike pests and predators from place to place.

Given that some losses are inevitable? the debate among many experts has shifted to an uncomfortable subject? what level of loss is acceptable. The discussion is taking place at both the local and global levels? How small can a fragment of an ecosystem be and still function in all its richness? and thus be considered preserved？ And as global biodiversity diminishes? is it a valid fallback strategy to bank organisms and genes in zoos? DNA banks or the like? or does this simply justify more habitat destruction？ Is nature on ice a sufficient substitute for the real thing？ Some conservation groups have strenuously avoided or even attacked such calculations and strategies. They say there is no safe diminution of habitat as long as human understanding of ecology is as sketchy as it is? a fallback strategy is unthinkable. Furthermore? banking nature in a deep freeze or database of gene sequences cannot capture context. For instance? even if a vanished bird was someday reconstituted from its genes? would it warble with the same fluency as its ancestors？ On the other side of the debate? those considering what the smallest viable habitats are or how to expand archives as an insurance policy say that re......

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