6 ideas
Collapse is analyzed through five factors: environmental damage a society inflicts on itself, climate change, hostile neighbors, loss of friendly trade partners, and the society's own response to these pressures. The first four vary by case and need not all be present, but the fifth, how the society responds, is always decisive. This makes collapse partly a matter of choice rather than pure fate.
Polynesian settlers on Easter Island cut down the island's forests, partly to move and erect giant moai statues in competition between rival chiefs. Without trees they lost canoes for deep-sea fishing, lost firewood, and suffered soil erosion, and the population and social order fell apart. The island is a closed-system warning: an isolated society that exhausts its resource base has nowhere to turn.
The Greenland Norse held on to European identity markers, including cattle farming, church building and a refusal to eat fish or learn Inuit hunting methods, even as the Little Ice Age and soil damage undercut their livelihood. The Inuit, living in the same environment, survived. The Norse died out because their values stopped them from abandoning practices that no longer worked, not because the environment left them no options.
Slow, gradual deterioration hides itself because each year's conditions look only slightly worse than the last, so the baseline drifts unnoticed. Once the people who remember the earlier state are gone, a degraded environment feels normal, and no single moment prompts alarm or action.
Societies fail in sequence: they do not anticipate a problem, fail to perceive it once it arrives, fail to try to solve it once they perceive it, or try and fail. A key driver of the third failure is rational bad behavior, where elites or interest groups profit from actions that harm the wider society. The danger is greatest when decision-makers are insulated from the consequences of their decisions.
The most important question about a threatened society is which core values it is willing to give up when circumstances change and which it will keep. Survivors such as Tokugawa Japan with its forestry reforms and Tikopia with its pig cull gave up cherished practices. Doomed societies held on to the very values that had once made them successful.