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Why can it be only useful after a collapse?

If it can be useful, than it can also be useful today to all the (poor) tinker people around the world today. There are lots of alternative eco villages etc. trying to be self sufficient, who do all kinds of recycling and improvised technology. If this adopts with those people, then it might be useful.

But if they cannot use this today, then I don't see how a broken down surviver group could use it.




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