Jared Diamond has moved on from Guns, Germs and Steel, which gave an account of what factors influenced the growth and development of civilisations in certain parts of the World and not in others. Collapse, looks at why civilisations, well, collapse..and why some do not. Well worth at watching his lecture, available online here.
A few key points include Jared's 5 main reasons for collapse:
1) Human environmental impacts
2) Climate change (and how that impacts environmental services provision)
3) Hostile neighbors (to take advantage of internal weaknesses)
4) Trading partners (as the society may be too dependent on successes or failures of neighboring societies)
5) A Society's institutions being able to perceive and solve, or ignoring and failing to solve the other 4 problems.
He also discusses some of the differences between the past and the present such as:
-We have more people with more potent destructive technologies that can cause more destruction more quickly.
-Faster communications and transportation of good and bad things like terrorists, immigrants and diseases.
-Societies cannot really collapse in isolation as there are likely to be consequences elsewhere, including remote countries like Somalia.
On the other hand, greater hope comes from the faster and greater spread of knowledge for us to learn from mistakes and successes around the World now, and in the past. This gives us the chance to know what we are doing and gives the choice to continue or to change.
Some things he seems to believe are not as important include cultural differences and political system differences, which is quite interesting. I have not read the book but am keen too. In particular I find 5) the most interesting issue.
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