可持续性不是一种选择，而是我们星球未来的必需品。

我写作是为了理解，为了理解世界和我在其中的位置。

To lead is to serve, not to command.

I went to the woods because I wanted to live deliberately. I wanted to live deep and suck out all the marrow of life. To put to rout all that was not life. And not, when I had come to die, discover that I had not lived.