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Settlement and Population
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| Once upon a time, the population started with settlements where people live. | |
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| It started to grow from 1800's, reaching one billion! | |
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Settlement and Population
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| Yes then, in 1970, 3 billion, 1999 6 billion growing one billion every 15 years. | |
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| Well, that has to do with births, deaths and migration. | |
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Settlement and Population
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| Now we have got better at healthcare, there are less deaths, less births... | |
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| It's just a pity that land does not bigger too! | |
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