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The desires, and other passions of man, in themselves, are in his own power; his real difficulties are, to know when they are to be controlled, and when not.
我们有责任为子孙后代留下一个比我们发现时更好的地球。
真正的问题不是气候是否在变化,而是我们能以多快的速度适应以及能适应多少。
森林的真正价值不能仅用板材英尺来衡量。
"You can't change the past, but you can change the meaning of the past."