Innovation in forestry must balance economic growth with ecological preservation.《绿色未来》

社会系统是个人与个人之间、群体与群体之间关系的网络。

We cannot be sure of having something to live for unless we are willing to die for it.

The first lesson of economics is scarcity: There is never enough of anything to satisfy all those who want it. The first lesson of politics is to disregard the first lesson of economics.

明智的人会将自己的信仰与证据相协调。