Sustainability is no longer an option; it's a necessity for any business that wants to thrive in the 21st century.

The relation between what we see and what we know is never settled.

理论的任务不仅是了解自然是什么以及它是如何运作的，而且要尽可能接近理解为什么自然是这样的而不是其他样子的不可达到的目标。