自然要多大才足夠？

　　How Much Nature Is Enough?

　　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

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