森林的真正价值不能仅用板英尺来衡量。

The principal effect of the progress of society is to increase the quantity of wealth, and the power of distributing it.

Sustainability is no longer an option—it's a business imperative for long-term survival.

你是你自己最好的东西。

The best way to predict the future is to create it.

和平不是人类所处的自然状态，而是必须被建立起来的。

最大的礼物是生命本身。