The challenge of our time is to harness energy without harming the planet.

The best leaders are those who can see the potential in others before they see it in themselves.

解释：大部分药材都以新鲜为好，但艾草却以陈年的为佳，体现了药材使用的特殊性。

Silence is the language of God, all else is poor translation.

True sustainability means leaving the land better than we found it for future generations.

检验一个经济学家是否优秀的标准，是看他能否比别人更好地解释过去。