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区分原则可以被称为理性环保主义的至高原则。它规定，对那些直接威胁人类健康与安全的生态变化采取应对措施是环境保护的必需品，而其他则都属于奢侈品。
For example, preserving the atmosphere - stopping ozone depletion and the greenhouse effect - is an environmental necessity. Recently, scientists reported that ozone damage is far worse than previously thought. Ozone depletion has a correlation not only with skin cancer and eye problems, it also destroys the ocean's ecology, the beginning of the food chain atop which we humans sit.
例如，保护大气层——阻止臭氧损耗及控制温室效应——是环境保护的必需品。近来，科学家报告说臭氧层遭受破坏的程度远比我们先前认为的要严重得多 。臭氧损耗不仅与皮肤癌及眼疾有关，而且它还会破坏海洋生态。而海洋生态是食物链的起点，人类则位于该食物链的顶端。
The possible thermal consequences of the greenhouse effect are far deadlier: melting ice caps, flooded coastlines, disrupted climate, dry plains and, ultimately, empty breadbaskets. The American Midwest feeds people at all corners of the atlas. With the planetary climate changes, are we prepared to see Iowa take on New Mexico's desert climate, or Siberia take on Iowa's moderate climate?
温室效应所可能引发的热效应是非常具有毁灭性的：冰川融化、海岸线被淹没、气候遭受破坏、平原干涸，最终食物消失殆尽。美国中西部地区的粮食供养着全世界。随着全球气候的变化，我们难道准备看到衣阿华州变成新墨西哥州的沙漠气候，而西伯利亚变成衣阿华州的温和气候吗？
Ozone depletion and the greenhouse effect are human disasters, and they are urgent because they directly threaten humanity and are not easily reversible. A sane environmentalism, the only kind of environmentalism that will strike a chord with the general public, begins by openly declaring that nature is here to serve human beings. A sane environmentalism is entirely a human focused regime: It calls upon humanity to preserve nature, but merely within the parameters of self-survival.
臭氧损耗和温室效应是人类的灾难，而且是需要紧急处理的灾难，因为它们直接威胁到人类，且后果很难扭转。理性环保主义——唯一能够引起公众共鸣的环保主张——首先公开声明，自然是服务于人类的。理性环保主义是一种完