Humanity starts with you, you don't think much of yourself; smile and the world smiles back, frown and it turns its back
Heaven and hell are here and now, so heaven can't get overpopulated, I'd settle for a good population and hell has far to big a population; the best part is that we get to choose which, right now:
Heaven = Being content with what we have, without fearing what we can't control (basically everything) and remembering the past and future doesn't exist. = Peace.
Hell = Being jealous of those with more, fearing others will take what you have, trying to control the world around you, lamenting the past and worrying about a future you can't possibly know, not to mention trying to plan a perfect day. = Torment.