Yes, human population is a factor. We know, for a fact, that we pump that shit into the ozone like nobody's business. However, we also know for a fact that the Earth goes through warming and cooling periods. If anything, we are speeding up a natural process. No matter how you cut it, there is global warming. No matter how little or how much, we do contribute to it. No matter how much we would like to think we can change shit, it's going to get hot here with or without our help. It's also going to get cold. The only thing we can do is try not to push the planet's buttons. These are facts. I would link shit, but this is common knowledge, meaning finding a reputable source will take you less than a minute, so do it your damn selves. 
