They passed a farmhouse, a simple shack surrounded by animals-a lazy burro, clucking chickens, a litter of pigs. The farmhouse stood alone in the desolate landscape. There was no sign of a living person anywhere. And then it was gone, lost in the swirling dust plume of the car.

The extreme positions of the Crossfire Syndrome require extreme simplification — framing the debate in terms which ignore the real issues.

Science is the most exciting and sustained enterprise of discovery in the history of our species. It is the great adventure of our time. We live today in an era of discovery that far outshadows the discoveries of the New World five hundred years ago.

Science is nothing more than a method of inquiry. The method says an assertion is valid — and merits universal acceptance — only if it can be independently verified. The impersonal rigor of the method means it is utterly apolitical. A truth in science is verifiable whether you are black or white, male or female, old or young. It's verifiable whether you like the results of a study, or you don't.

I want to state emphatically that nothing in my remarks should be taken to imply that we can ignore our environment, or that we should not take climate change seriously. On the contrary, we must dramatically improve our record on environmental management. That is why a focused effort on climate science, aimed at securing sound, independently verified answers to policy questions, is so important now.

I have included experiences in the realms that are sometimes called psychic, or transpersonal. or spiritual. I think of this as inner travel, to complement the outer travel, although that distinction — between what is internal sensation and what is external stimulus — often blurs in my mind.