Our genetic coding will not allow that. We need to be re-programmed. The Watermelon idea is a good one. People need some incentive to get the Population Explosion under control. Say, Tax benefits, a special "ZPG Fund" that rewards couples without children, some sort of penalty for those who do. Can you visualize that? I can't. And here's something else to consider - How do you convince the Islamic World that this is the way to go?