Population and Migration

    In class today, we focused more on talking about population. There are over 7 million people living on the earth right now. The population is increasing by 77 million more people per year. Life expectancy is the average number of years that are expected to be lived by a group of people who were born in the same year. It seems that women usually live longer than men. For example, if you look at the life expectancy of the United States, you'll see that the average is about 78 years old. If you look more into depth, you'll discover that men usually only live to about 76 years old while women live to about 81. Women tend to live longer because they take more care of their health on a daily basis and have less risky jobs. You can measure population by the crude birth rate, the crude death rate, and the rate of natural increase. Crude birth rate is the number of births per 1000 of the population. Crude death rate is the number of deaths per 1000 of the population. The rate of natural increase, RNI for short, give us the natural growth rate for a country. You can find this by subtracting the death rate from the birth rate and then dividing it by 10.