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Q&A What level of technology would be necessary to allow a worldwide system of massive canals be built?

Following up on my Martian canals theme from this question and assuming the canals can be constructed, I would now like to ask what level of technology is required to do that. The basic problem Th...

1 answer  ·  posted 7y ago by Slarty‭  ·  last activity 7y ago by Slarty‭