According to the demographic transition model, what happens to birth and death rates over time?
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Why does a country's population grow in both stage 2 and stage 3 of the demographic transition model?
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Some geographers claim that there is now a fifth stage, where the death rate is above the birth rate. Under this situation, what will happen to a country's population?
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According to the table on world population, between what two dates did the percent of yearly growth begin to climb quickly? What important historical event happened at this time?
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What is the current "doubling time" for world population? What are three reasons why we should be concerned about this?