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Cheap, easy-to-assemble, open source technologies that will help communities to protect themselves will really change the world :-(

Unless you can open source a few billion cubic meters of concrete it would have done fuck all.

Assuming concrete is the only solution to the problem.

When the problem is essentially damming a 100-mile wide river, yea, it's pretty much the only solution. Again, the damage here was the tsunami-scale storm surge, not so much the wind.

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