Review 1

More people than ever?
over 7.5 billion people on planet right now.
increasing by over 73 million per year.
by approx, 200000 per day
9377 per hour
149 per minute
2.5 persecond
90 percent of this population growth takes place in the developing countries of africa, south adn east asis and latin America
ife expectancy
the average number of years to be lived by a group of people born in the same year
High: Monaco 89.52 total 85.63men 93.58women
#42 U.S.          79.68 total 77.32men 81.97women
low Chad         49.81 total 48.64men 51.03women
measuring population
Crude birth rate: Number of births per 1000 of the population
Crude death rate: Number of death per 1000 of the population
Rate of natural increase(RNI)
Produced by subtracting the death rate from the birth rate
This gives us the annual natural growth rate in percentage form for a country or region
But don't forget about migration
more mearsurement of population
Net Migration Rate: the difference between the number of people entering and leaving a country during a year.
an excess of people entering the country is immigration.
written as positive number
EX: Canada has 5.65 migrants per 1000 population.
       United states: 2.45（it was 3.62 in 2015）
an excess of persons leaving the country is net emigration.
written as a negative number.
example: Mexico has -1.68 migrants per 1000 population
                                   - 3.61 two years ago, -3.11 last year
why do people migrate
push forces
civil war
environmental degradation
unemployment or underemployment
religious or ethnic persecution
pull force
better economic opportunity
better health services
religious freedom
political freedom