People and the planet

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World population Growth

1) World population has grown from 1 billion in 1804 to about 7 billion in 2012. The main reason for this rise is the fall in the death rate (DR).

2) More recently, there has been a fall in the birth rate (BR). This means that the rate of population growth is predicted to slow down, though nobody knows when zeropopulation growth will be reached some have suggested the early 2020s but others thinks global population will be reach 10 billion by 2100.

Population pyramids:

1) Show the number or percentage of different age groups for each gender in the population.

2) Can be used as a snapshotto show what stage of the DTM a country is at.

3) Change shape as acountry deveops - the bottom narrow as the birth rate lowers; the top ets higher and wider as life expectancy increases.

4) Show short-term factors that impact on population, e.g. war leading to a high death rate especially in young adult males.

5) Can forecast population totals and growth rates to help future planning.

Population…

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