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Or flooding them with such, first? Not that I know which currently-known planets we could do that on.

Thermonuclear bomb the Mars ice caps. I think I read that in a scifi book.

Mars is really cold. At the equator the thin atmosphere can heat up reasonably at noon, but it still hits minus 100f at night even at the equator.

There are subterranean brine rivers on mars so large that they can be seen from orbit.

https://www.nasa.gov/press-release/nasa-confirms-evidence-th...

Not quite. Here is a link that's probably easer to understand.

https://science.nasa.gov/science-news/science-at-nasa/2000/a...

We are not looking at underground water in those pictures we are looking at evidence of likely very short term water causing a tiny amount of erosion in just the right situation. However, it's long been known there is actually quite a lot of ice on Mars.

Slam a shitload of comets into it, like in Seveneves.

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