Well, we do replicate. Maybe not as much as rabbits. And, recently, we die less in childbirth and infant-hood. So - even with falling childbirth rates, we stil

Well, we do replicate. Maybe not as much as rabbits. And, recently, we die less in childbirth and infant-hood. So - even with falling childbirth rates, we still tend to multiply a bit. But given that absolute and relative global poverty rates and starvation rates and disease mortality rates have plummeted and population grows dramatically - it becomes a resource allocation problem. Germany (for example) needs more laborers because of plummeting domestic birth rates. The retired community's social net requires young tax-payers to pick up the burden. Demographics are screwing with this math. Somalia or Syria (for example) have a lot of folks that need to escape. Problem: Once Turks or Arabs or Persians or Somalians or Syrians or Northern Africans get to Germany - they may or may not want to learn the language - but as refugees, they get full public benefit. And are not willing to learn or work to support retired Germans (this is an isolated example). Maybe we have an exploding population in all the wrong places? (I am not recommending genocide - just: It is a wicked problem)