Population Growth

Today in human geography class we went over a power point about our population. today there is about 7 billion people on Earth right now. About 33 years ago there was under 3 billion people on Earth. Our planet is rapidly growing in the population. We also learned that we got the 7 billion people on Earth because per second there is a 2.4 person increase on Earth. So every second 2.4 more people are on Earth. We learned that 90% of population growth takes in the developing places which are Africa, South and East Asia and Latin America. Also the U.S.'s Net migration is 3.62 people. So every one person that leaves the U.S. about 4 more enter it. But we are not the highest in that. A lot of people think we are because all of the Mexicans that migrate illegally but not that many more try to now because its a lot harder now then it was back then. The last thing we learned was Total Fertility Rate. This is the average number of children a women has or gave birth to. For the U.S. we have a little bit more than 2 (2.06) TFR. So the average women has 2 kids in the U.S. but right after the civil wars it was a lot higher. It was more around 5 children. That was because the economy was good then and people could afford it but now the economy is not s good so not as many women are having a lot of kids. That is what I learned in human geography class today.