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Biodiversity can’t be maintained by protecting a few species in a zoo, or by preserving greenbelts or national parks. To function properly, nature needs more room than that. It can maintain itself, however, without human expense, without zookeepers, park rangers, foresters or gene banks. All it needs is to be left alone.

每一项政策都受到两种力量的影响：背景分析与前台政治。政治力量声势浩大、自私自利，而在能源政策方面，这一点更是众所周知。.