From The New Renaissance:
"During your lifetime, the people of our culture are going to figure out how to live sustainably on this planet--or they're not. Either way, it's certainly going to be extraordinary. If they figure out how to live sustainably here, then humanity will be able to see something it can't see right now: a future that extends into the indefinite future. If they don't figure this out, then I'm afraid the human race is going to take its place among the species that we're driving into extinction here every day--as many as 200--every day"