First of all a flow diagram:
Note that this is for a country, not the planet, since people (so far) are not leaving the planet...or arriving from elsewhere.
National version as a formula:
If you look at the planet as a whole (sans aliens or Elon Musk):
so, there is a neat shorthand formula for this:
Which is an estimate, the real number is 69.3 (why?)
Here is an example:
Note that as the growth rate increases, the doubling time decreases.
Look for this on the AP as multiples/fractions of 70: 14, 28, 35, and so on...
Now, to babies: TFR is the total number of babies a woman will have in her lifetime.
Replacement level fertility is just above 2.0, (usually 2.1, as some babies don't reproduce or make it to reproductive age).
What does this mean in Japan, where young people are not having babies?
RLF depends on developed/developing nations as well (clean water, medical care, access to food, war)
Life expectancy: depends on these as well...
Infant mortality: under age 1 (reason for big Hawaiian one year birthdays)
child mortality: under 5
Age structure diagrams/population pyramids-check these out: UAE, Japan, Sudan, Iraq/Iran, Russia----WHY?
See also baby boom and boom echoes...
Module 23 Demographic Transition
Better diagram:
IPAT formula:
GDP vs. GNP (nationalism, global economy)
Urban areas, UGB (Portland)
See also Ecological Footprint Calculator:
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