we're still animals. You don't blame your dog for being a dog. He can't change his nature. Despite what our cortex tells us, neither can we. We have to reproduce. The green revolution of the last 40 years hasn't solved the problem. Quite the opposite. It has allowed us to to overshoot even further the carrying capacity of the planet. Most people still don't see any need to stop the madness. The great religions still urge their adherents to be fruitful and multiply. Modern capitalism is still based on the premise of endless growth. The Chinese, with total top-down control, have only managed to restrain population growth to .5%, not stop it entirely.. Even at that rate there will still be more than 2 billlion Chinese by 2150. The only effective constraints historically have been famine and disease. We haven't been there in a while, but it's familiar territory.