Directorios

Enlace: http://www.learner.org/exhibits/collapse/

Descripción: Learner.org
«The history of humankind has been marked by patterns of growth and decline. Some declines have been gradual, occurring over centuries. Others have been rapid, occurring over the course of a few years. War, drought, natural disaster, disease, overpopulation, economic disruption: any of these can bring about the collapse of a civilization. Internal causes (such as political struggles or overfarming) can combine with external causes (such as war or natural disaster) to bring about a collapse.»