可持续性是采石业的未来，我们必须立即行动。

You are never too old to set another goal or to dream a new dream.

The path to a sustainable energy future requires a balanced approach that considers economic, environmental, and social factors.

What a man can be, he must be. This need we call self-actualization.

一个人需要相当的知识才能意识到自己的无知程度。