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• "Overpopulation"  + (<font face="{{{font}}}">“''Overpopul … <font face="{{{font}}}">“''Overpopulation'' and the overreliance on irrigation was a major factor in making the Maya vulnerable to failure: </br>the trigger event of their</br>collapse appears to have been a long ''drought'' beginning about 840 A.D.</br>(communication of V. Scarborough, an archaelogist (sic!) from the University</br>of Cincinnati [90]). Among many factors, such as war and ''plagues'', that</br>contributed to many of the collapses of ancient societies, there seem</br>to be two main causes: ''too many people and too little fresh water''.</br>As a consequence, the civilization became vulnerable to environmental</br>stress, for instance, a prolonged drought or a ''change in climate'' [90].</br> </br>The societies themselves appear to have contributed to their own demise</br>by encouraging ''growth of their population'' to levels that carried the</br>seeds of their own decline through overexploitation of the land (communication of C. Scarre, an archaelogist (sic!) from the Cambridge University</br>in England [90]). Similarly, the Akkadian empire in Mesopotamia,</br>the Old Kingdom of Egypt, the Indus Valley civilization in India,</br>and early societies in Palestine, Greece, and Crete all collapsed in a [[Disaster|catastrophic]] drought and ''cooling of the atmosphere'' between 2300 and 2200 B.C.” of the atmosphere'' between 2300 and 2200 B.C.”)

• "Overpopulation"  +