nine billion people Census.gov data anticipated 7 billion people data 9 billion before 2050 doubled doubled likely to exceed nine billion data largest doubled by 2050 data U.S. Census Bureau 9 billion mouths data U.S. Census Bureau Source population is exploding data https://www.census.gov... world population has more than doubled and growing data population population could swell to well over 9 billion doubled doubled nine billion people doubled US Census Bureau largest Source by 2050