Human population

Human population

1. Changes in population

   • Growth
     • occurs the exponential growth
       • so you can estimate the population growth
         • lag phrase
           • use to a new environment
         • exponential phrase
           • occurs while all requirements are in superabundance
         • stationary phrase
           • population in equilibrium and with the carrying capacity of the environment
   • carrying capacity
     • maximum population size
       • if it exceed there will be devastating consequences

2. birth rate

   • the total number of live births over time
   • balanced by the
     • death rate
       • the total number of deaths over time
     • the birth rate minus the death rate

3. Population growth

   • results between birth and death rate
     • if there is migration is more complicated
       • immigration means people entering an area from outside
       • emigration means people leaving an area from inside
       • push factors
         • problems in rural areas
       • pull factors
         • better life in the city

4. Human population distribution and density

   • density
     • Average value
       • dividing the umber of people living in a place by the area of that place
   • distribution
     • how the population is spread over that area

5. population structure

   • age pyramid
     • expanding
     • stationary
     • declining
     • dependent
       • people who are not economically active
     • independent
       • people who are economically active

6. managing human populations

   • family planning
     • is the strategy that the couples use to plan how many and when to have children
     • contraception
       • use it to persuade people to have onle one child
   • nation population policies
     • pronatalist policy
       • declining population
         • parents paid for having a third child
     • antinatalist policies
       • population increasing too fast
         • faily planning, contraceptives and education