事实上，自然科学长期以来只是大脑和想象力的产物：现在是时候回归到对物质和显而易见事物的朴素而健全的观察了。

History has neither the desire nor the capacity to make men better or worse; it merely records what they have been and what they have done.

可持续性不仅仅是一种趋势，更是我们对后代的责任。