但特别是当我们回顾美国动荡的过去时，今天的社会指数很难表明一个黑暗和恶化的社会环境。
But particularly when viewed against America's turbulent past, today's social indices hardly suggest a dark and deteriorating social environment.
如果我们要避免与水有关的紧张局势扩散和恶化，这种团结是必要的。
Such solidarity is necessary if we are to avoid a proliferation and aggravation of tensions relating to water.
又或者说不断上升的能源成本和恶化的环境灾难让人类付出了惨重代价。
Or suppose there is a slow decline as soaring energy costs and worsening environmental disasters take their toll.
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