The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.

The function of mental processes is to mediate between the needs of the organism and the demands of the environment.

对自然界的理解及其内涵不仅是巨大好奇心的来源，也是巨大成就感的来源。