We're at about 7.5 billion currently and we hit 1 billion in 1804. Population growth peaked in the 1960s and has been slowing ever since, we may not hit 9 billi

We're at about 7.5 billion currently and we hit 1 billion in 1804. Population growth peaked in the 1960s and has been slowing ever since, we may not hit 9 billion until sometime between 2040 and 2050.