Because six billion of us are pursuing an evolutionarily unstable strategy, we're fundamentally attacking the very ecological systems that keep us alive. Just like the goat that refuses to suckle its kids, we're in the process of eliminating ourselves. Think about the time line Charles drew in his talk about the boiling frog. For the first six thousand years, the impact of our evolutionarily unstable strategy was minimal and confined to the Near East. Over the next two thousand years, the strategy spread to Eastern Europe and the Far East. In the next fifteen hundred years, the strategy spread throughout the Old World. In the next three hundred years, it became global. By the end of the next two hundred years--which is now--so many people were following the strategy that the impact was becoming catastrophic. We're now about two generations away from finishing the job of making this unstable strategy extinct.