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If you're interested in reading more about the challenges and benefits, I would definitely recommend "Mining the Sky" by John S Lewis. It is a very approachable book even if you're not too savvy with rocket science, but it is technical enough that you get a good idea of the costs and benefits involved.
Personally, between Planetary Resources and projections for solar costs in the near future, I'm starting to think that the time frame around 2022 will usher in one of the largest economic booms the earth has ever seen - without relying on dirty energy or scarce resources, and effectively erasing many of the primary environmental concerns we're faced with.
The post-WW2 boom will look pale in comparison...
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