可持续性不是一种选择，而是一种责任。

But it is the same with man as with the tree. The more he seeks to rise into the height and light, the more vigorously do his roots struggle earthword, downword, into the dark, the deep - into evil.

The past is a foreign country; they do things differently there.

I invent nothing, I rediscover.

Sustainability must be profitable, or it won't be sustainable at all.