Technology should serve both efficiency and ethics in mineral extraction.

我对蛋糕的政策是支持拥有它并支持吃掉它。

对财产的过度关注，胜过一切其他因素，阻碍了我们自由高尚地生活。

I try to leave every place a little better than I found it.

The real tragedy of the poor is that they can afford nothing but self-denial.