The trails are a reminder of our insignificance. We come and go, but nature is forever. It puts us in our place, underscoring that we are not lords of the universe but components of it...So when the world seems to be falling apart, when we humans seem to be creating messes everywhere we turn, maybe it's time to rejuvenate in the cathedral of the wilderness - and there, away from humanity, rediscover our own humanity.

Solar power is one of the most hopeful technologies but still produces about 0.01 percent of U.S. electricity. The U.S. allocates just $159 million for solar research per year - about what we spend in Iraq every nine hours.

If President Bush is serious about genocide, an immediate priority is to stop the cancer of Darfur from spreading further, which means working with France to shore up Chad and the Central African Republic.

When anesthesia was developed, it was for many decades routinely withheld from women giving birth, since women were "supposed" to suffer. One of the few societies to take a contrary view was the Huichol tribe in Mexico. The Huichol believed that the pain of childbirth should be shared, so the mother would hold on to a string tied to her husband's testicles. With each painful contraction, she would give the string a yank so that the man could share the burden. Surely if such a mechanism were more widespread, injuries in childbirth would garner more attention.

...Environmental groups are too often alarmists. They have an awful track record, so they've lost credibility with the public.

If one is talking to a finance minister of a poor country, moral arguments tend not to get very far. But if you can argue that their country is going to grow 2 percent faster per year if they can just harness the power of the female half of the population more effectively, that is an argument they consider.

We, as Americans, have won the lottery of life and the distinction between us and people living in Kalighat is not that we are smarter, not that we're harder working, not that we're more virtuous - it's that we're luckier.