"With the world's human population now at seven billion and growing, and the demand for technology and modern conveniences increasing, we can't control all our negative impacts. But we have to find better ways to live within the limits nature and its cycles impose."

"Hydraulic fracturing requires massive amounts of water. Disposing of the toxic wastewater, as well as accidental spills, can contaminate drinking water and harm human health."

"Education has failed in a very serious way to convey the most important lesson science can teach: skepticism."

"Over and over, we hear politicians say they can't spend our tax dollars on environmental protection when the economy is so fragile."

"Education is the best economic policy there is."

"I suggest that the introductory courses in science, at all levels from grade school through college, be radically revised. Leave the fundamentals, the so-called basics, aside for a while, and concentrate the attention of all students on the things that are not known."

"Education without values, as useful as it is, seems rather to make man a more clever devil."

"My voice went recently, never happened before, off like a tap. I had to sit in silence for nine days, chalkboard around my neck. Like an old-school mime. Like a kid in the naughty corner. Like a Victorian mute."