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shminux comments on Crazy Ideas Thread, Aug. 2015 - Less Wrong
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We need to create more rivers! Water transport is still cheap and important for development, but sub-Saharan Africa and the middle of Asia are sadly deficient in rivers.
River creation is an interesting example of something which isn't forbidden by the laws of physics, but seems utterly unfeasible. Is there any imaginable technology for making rivers?
Airship transport is even cheaper and more energy-efficient.
I don't think that's true, see the graph from this article: http://blogs.scientificamerican.com/guest-blog/helium-hokum-why-airships-will-never-be-part-of-our-transportation-infrastructure/