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ジャレド・ダイアモンド 文明崩壊は何故起こるのか 動画 ted.com https://www.ted.com/talks/jared_diamond_on_why_societies_collapse/transcript?awesm=on.ted.com_s04vz&utm_medium=on.ted.com-none&share=1dbdf455dd&utm_source=direct-on.ted.com&utm_c…