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

"The question is whether any civilization can wage relentless war on life without destroying itself, and without losing the right to be called civilized."

"I am not an alarmist, but I am gravely concerned about the future of life on Earth."

"If I had influence with the good fairy who is supposed to preside over the christening of all children, I should ask that her gift to each child in the world be a sense of wonder so indestructible tha…"

"We are surrounded by an infinite number of wonders, and yet we see so few of them."