What are some potential weaknesses of civilizations according to the Lifespan of Civilizations article?
Climate change: When climatic stability changes, the results can be disastrous, resulting in crop failure, starvation, and desertification. The collapse of the Anasazi, the Tiwanaku civilization, the Akkadians, the Mayan, the Roman Empire, and many others have all coincided with abrupt climatic changes, usually droughts.
Environmental degradation: Collapse can occur when societies overshoot the carrying capacity of their environment. This ecological collapse theory, points to excessive deforestation, water pollution, soil degradation and the loss of biodiversity as precipitating causes.
Inequality and oligarchy: This not only cause social distress, but handicaps a society's ability to respond to ecological, social, and economic problems. As population increases, the supply of labor outstrips demand, workers become cheap, and society becomes top-heavy. This inequality undermines collective solidarity and political turbulence follows.
Complexity: Societies are problem-solving collectives that grow in complexity in order to overcome new issues. However, the returns from complexity eventually reach a point of diminishing returns. After this point, collapse will eventually ensue.
External shocks: In other words, the "four horsemen": war, natural disasters, famine and plagues.
Randomness/bad luck: Statistical analysis on empires suggests that collapse is random and independent of age.