POLLUTION
Demographic Transition
From the actual historical experience of a number of European countries and the United States of America some scholars have inferred that populations historically pass through different more or less well-defined stages in terms of their levels of fertility and mortality. Developed as an attempt to formulate a generalised explanation of the process of mortality and fertility decline in those countries, the transition theory was elaborated and received a much broader interpretation in more recent decades, when it was thought to be applicable also to the less developed countries that are still in the early stages of demographic change.
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