There are over 7.6 billion people on the planet right now
It increases by over 73 million per year.
Life expectancy: the average number of years to be lived by a group of people born in the same year.
I also learned that there is a birth every 8 seconds and death every 11 seconds
some people migrate and there are two diffferent catagories. One is push forces and that includes: civil war
environmental degradation
unemployment or underemployment
religious or ethnic persecution
Then there are pull forces: better economic opprtunity
better health service
religious freedom
political freedom
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