Population Insanity

Today we learned about the mass amount of people we have on the planet Earth. We have about 7 billion people on the world at this moment which is just such a hard number its insane to even think about. The only views of Earth that we have are pictures from space and comparisons on globes and they are pretty tiny which makes it very hard to imagine that many people on a very tiny Earth. One thing about population that does bug me a little bit is that the people who can afford to have kids sometimes don't. I understand that it's a big decision but sometimes it's just based on the money put into the kids and that is just ridiculously greedy that I can't stand it. There are people in 3rd world countries having about 5 kids per family hoping that one or two may survive to adulthood when we sure know that in America they will survive if they have parents who provide for them.