Life Expectancy and Population Growth

Today in class we talked mostly about  Life Expectancy and Population Growth.  Life Expectancy is the average age that something lives.  For example, our country has a Life Expectancy of around 79 years between males and females.  Males tend tom live a less life where as women live a longer life.  Our country isn't that far up there on the charts.  You would think since our country is pretty wealthy and healthy that we would be way up there.  The amount of humans living in the United States are obese is high.  This obviously end to a shorter life besides car crashes and natural disasters and things like that.  Population growth in the world had been getting faster and faster.  It took over 10,000 years to get 1 billion people.  Now it can take on 12 or 13.  This is a very big difference.  It is still going to get faster and faster.