We are all much healthier than we were 20 years ago, but mentally, we're falling apart. The World Health Organization now estimates that one out of five people on the planet is clinically depressed.
Everything that we need to make an atmosphere on Mars, and to make a livable planet on Mars, is probably there.
We give antibiotics to every cow, every lamb, every chicken.
... This is like being at war, and giving somebody your secret code. We're telling the germs out there how to fight us.
Somewhere in the Amazon forest is the marginal tree.
You cut down that tree, the rain forest collapses as an ecosystem.
We don't really have mental health insurance in this country [the United States], and it's really a crime.