The first 5 minutes of this talk are only the speaker explaining how he used to be very, very wrong. He's since changed his mind, reversing entirely his views on how to slow climate change, based not on computer models but on experiments repeated on millions of acres of former desert, all returned to grassland. His message: we can reduce the level of atmospheric carbon, restore grasslands formerly lost to the desert, and feed millions of poor people.
We just need to think differently. We need to think scientifically.
This is very, very inspiring in a results matter sort of way. I'm happy to consider myself to be this sort of environmentalist.