The act of writing is an act of optimism.

What I want to talk to you about today is the difference between gifts and choices. Cleverness is a gift， kindness is a choice. Gifts are easy -- they're given after all. Choices can be hard. You can seduce yourself with your gifts if you're not careful， and if you do， it'll probably be to the detriment of your choices.

Sustainable development is not a choice, but a responsibility.

La imaginación es el único territorio libre que nos queda.

If they're all lies, shouldn't we try to stay away from them? But we can't.

True forest stewardship means leaving some trees - and some profits - for those who come after us.