What plants do we have that survive cold weather well?
According to Elton John, it’s cold as hell on Mars.
Plant a LOT of them on Mars and wait a while. You’ll hava a “shirt-sleeve atmosphere.”
Bring a few comets in at a shallow re-entry angle, and you can have all the water you want —assuming the “Fountains Of The Deep” may be too hard to stimulate...
He was just a normal 9 to 5 rocket man. Bowie went to Mars. 😁