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Maybe...but what is going to be cheaper? "fixing" Earth ? or making a new Earth on Mars?

I assume the idea is to build a sustainable Mars, and then leave earth to die - and the 99.9% with it.

I can't see this now since the terraforming would cost much more than avoiding a bad future here ! That could change of course in the next 20 years... For now I see Mars as a pit stop to refuel and get more food so humans can explore further the universe xD