This probably has been mentioned before, but the solution to this problem is that we need BETTER people, not MORE. I believe for one that we need to take a long, hard look at ourselves and our species and which way we want it to evolve. Before people start throwing insults, rocks, or threats to burn down my house, I would like to say that forcing people to sterilize themselves to prevent their 'bad' genes from being passed on is immoral and impractical. Rather, our governments should band together and start programs, like free basic healthcare to a person with 'bad' genes who gets themselves sterilized. Of course, the problem here is deciding which person has more right to reproduce than others. Some genetic 'defects' like cystic fibrosis or haemophilia are easy choices as they cause diseases that will only hurt, but other issues are not so straightfoward. To that end, an ethical debate should be started. It will be difficult, but in the end this form of directed evolution can be our saving grace.