too many people?

OK so we are overpoplating our planet. First of all how did this happen? Are we just randomly breeding like bunny? Anyway we need to figure something out to stop this continuing. In the past there have been limits on how many children you can have but I don't like that idea. What if we coloinized a new planet. Make a big glass doom over the moon like they do in old scifi movies and then we can live there in our flying cars and teleportation tunnels. No I have no idea what to do if that happens. I guess the best way would be to limit the amount of children a couple can have. Or at least the is the best peaceful way.