The future of coal depends on balancing economic growth with environmental responsibility.

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.

The existence of a legal system is a matter of fact, not of morality.

数学家是模式的创造者，就像画家或诗人一样。

"We're not perfect, but we're perfect for each other."

能源转型不仅仅是减少排放，更是为世界提供可靠且负担得起的能源。