Population Decline (Paperback)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Population decline can refer to the decline in population of any organism, but this article refers to population decline in humans. It is a term usually used to describe any great reduction in a human population. It can be used to refer to long-term demographic trends, as in urban decay or rural flight, but it is also commonly employed to describe large reductions in population due to violence, disease, or other catastrophes.Sometimes known as depopulation, population decline is the reduction over time in a region's population. The decline can be caused by several factors including sub-replacement fertility (along with limited immigration), heavy emigration, disease, famine, and war. History is replete with examples of large scale depopulations. Many wars, for example, have been accompanied by significant depopulations. Before the 20th century, population decline was mostly observed due to disease, starvation and/or emigration.