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4.1 human pop trends (people move from rural to urban areas (mostly in…
4.1 human pop trends
people move from rural to urban areas
mostly in less developed countries
growth rate increasing since 1965
more than 50% live in urban areas
many developed nations are stable or declining
growth
exponential (j curve)
agricultural revolution
industrial revolution
logistic (s curve)
most populated countries ar China and USA
growth unevenly distributed
less developed countries have bigger growth
more developed countries have smaller growth
currently exponential, by 2050-2100 probably logistic
population future projections vary
difficult to predict factors that affect birth rates and death rates
different data sets
growth has dropped by 1.2% since 1965
exponential increase still present