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They were all pretty close. Give it another 50 years. And the sad thing is we will have done nothing to get ready because of these unrealistic concepts that keep getting put forward like harvesting asteroids and transmitting 100's of TerraWatts of power via em waves. Can't happen. And they will hate us for wasting everything we did have on cruise ships and football stadiums.There is no gleaming techno salvation for 11 Billion people. We need to wake up and focus what we have left.
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