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I haven't seen any evidence we could actually harness the resources on mars without tech that doesn't exist. E.g. fusion power.

Without orbital infrastructure shipping supplies in neither are viable.

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You don't need fusion power to melt ice, to move regolith over habitats for shielding, or to melt rocks to extract and process metals. I have absolutely no idea where you get the notion that it meeds fusion power? Solar power or things like kilopower reactors are a great option for Mars, especially for bootstrapping.

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