Human and nature dynamics (HANDY): Modeling inequality and use of resources in the collapse or sustainability of societies / April 2014
http://www.theguardian.com/environment/earth-insight/2014...
"By investigating the human-nature dynamics of these past cases of collapse, the project identifies the most salient interrelated factors which explain civilisational decline, and which may help determine the risk of collapse today: namely, Population, Climate, Water, Agriculture, and Energy."