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> It would take a few million or billion years, but it would be cheap.

Then of what practicality would it be? Humans will not exist in a few million/billion years, at least not in their current form.

Hopefully we’ll get Humans 2.0 on Mars in a few billion years that re-evolved natively from microbes. And hopefully they’re wiser than us.

The sun will eventually expand I think in like a billion years or so. Is there any food on Mars?

Mars will experience same level of solar flux in around 5 Billion years. That’s about the same age as life on earth. So there is a chance.

Terraformed mars ready for our future corvid derived successors?