What worries me is that the soil has now become so depleted in so many places, hasn't it? And it's become degraded and plowed up and over fertilized. Was that part of the reason you wrote the book, that you were looking at the soil and you realized how depleted it had become? Yes. So i think there were two drivers: some very urgent concern about the state of the soil because we're treating it like dirt. But on the other hand, these astonishing new developments in soil chology show us a whole new way, potentially, of farming. We can use that to radically change the way we farm.