This week, the UN estimated that the global population has officially hit 8 billion people. As Forbes reports, this happens just 11 years after the world hit the 7 billion population mark, and can be attributed to longer life expectancies thanks to advancements in health and technology. Head over to Forbes for a look at the major takeaways from the UN's announcement, including where most of the population growth is happening, what global life expectancies look like now and more.