"I am haunted by the thought of what we are doing to the earth."

"There was a time when man had a closer communion with the natural world, but now we have become so separated. We have lost our sense of wonder."

"The beauty of a tree, the song of a bird, the murmur of a stream—these are the things that nourish the soul."

"I am not a scientist in the sense that I wear a white coat and work in a laboratory. I am a writer, and my laboratory is the world around me."

"One way to open your eyes is to ask yourself, 'What if I had never seen this before? What if I knew I would never see it again?'"