“Pipe dreams are more realistic than your suggestions.”
I don’t anticipate anyone spending the money in the next decades for terraforming Mars, and beyond that any forecast is mush. This is really about discussing if it is even possible. It is a thought experiment, not a project proposal. Einstein talking about travelling at the speed of light is still further out there than terraforming Mars is, even a hundred years later.
In the future, robots could well be intelligent enough to build other robots from raw materials, so that you only have to buy an initial small number, and let them build a workforce large enough for the project own their own.
Do you have any specific (logical, factual) points to raise, or you just want to rail that “Man will never fly” or some such?
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Simply, I believe the Word of Yehova.
Soon you will too!