One great idea I heard to make mars more habitable in general is creating a large magnetic field at a Lagrange point between mars and the sun. A sort of "radiation sunshade"
Most terraforming research tends to be more realistic, and therefore looks at scales of thousands of years for change to take effect, often driven by engineered single-celled organisms in stages.
I discovered his channel a few weeks ago, and was blown away. He has tons of videos that cover all aspects of humanity's potential future in the stars in great detail, and does a very good job of staying grounded in hard science. It seems like he really knows his stuff. The episodes can be quite long (15 - 60 mins), but definitely worth checking out. I've been slowing making my way through them.
So far, I've really liked the video on "Black hole farming at the end of civilization", some of his Fermi paradox episodes, as well as the one on terraforming.
That sounds like it would be massive, or actually maybe not, like a shadow getting bigger the farther it is away from light.
What about the Mars-based idea, that massive wire that wraps around Mars I think.
I don't know, we'd have to get the atmosphere from somewhere, maybe after the magnetosphere is re-established whether artificially or inside Mars, grab asteroids with ice and use that for the atmosphere.
Seems to me, a process capable of refreshing a livable atmosphere could just be used as needed, given a sufficiently long depletion time line.
Anyone have ideas or info on what that looks like? My mind moves to things like diverting ice from space. Big scale.