The key to teaching anything is to remember what it was like not to understand that thing. That's a very hard thing to do. Every time you come to und….

The world will soon start to run out of conventionally produced, cheap oil…. We [will] start to run out of all fossil fuels by the end of this centur….

Civilization as we know it will come to an end sometime in this century unless we can find a way to live without fossil fuels..

No matter what else happens, this is the century in which we must learn to live without fossil fuel..

Ludwig Boltzmann, who spent much of his life studying statistical mechanics, died in 1906 by his own hand. Paul Ehrenfest, carrying on the work, died….