translation.en: In analyzing societal collapses, I've arrived at a five-point framework -- a checklist of things that I go through to try and understand collapses. And I'll illustrate that five-point framework by the extinction of the Greenland Norse society.
translation.zh: 在分析社会崩溃的过程中，我设计出了一个 “五点架构”：这其实是个清单，枚举了我为了解释社会崩溃之谜 而考虑的每一个因素。下面，我将通过分析格陵兰岛上的维京部落的消亡