Now for this, you would need to take random couples from the whole population (so you'll need almost 4 billion cars for the first round), let them have sex in the car, then crash the car. You'd repeat with the survivors.<p>I'd guess you'd get promising results quickly enough, half a dozen generation or something.<p>And an interesting side effect would be that you'd solve the hunger and "human-made warming" in the world at the same time.