"The beauty of the natural world is a gift that must be cherished and protected."

"The 'control of nature' is a phrase conceived in arrogance, born of the Neanderthal age of biology and philosophy, when it was supposed that nature exists for the convenience of man."

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

"The road we have long been traveling is deceptively easy, a smooth superhighway on which we progress with great speed, but at its end lies disaster."

"Perhaps the most serious of all the omissions of the mass extermination programs is the failure to take into account the fact that environmental pollution is a two-way street."