Experience is simply the name we give our mistakes.

It is no use saying, 'We are doing our best.' You have got to succeed in doing what is necessary.

我们今天种植的每一棵树都是为我们永远不会见到的后代留下的遗产。

现在就去做吧。未来对谁都没有承诺。

Sustainability isn't an option; it's a necessity for the future of energy.

解释：对事物最好的证明是有效果，对论点最好的认定是有证据。