There are 7.6 billion people on this earth.

Something amazing is that for so long the number of humans was around 10 million or less. In recent times, we've been able to increase our numbers so rapidly. But then maybe I'm just looking at things with too broad an eye. New advanced in technology, if fully utilized, could allow us to support tens of billions of people. Truthfully, we are like any other organism, we will expand as much as we can. It's not unnatural. But hopefully we're smart enough to survive the world we create.