It is all a matter of scale. If you were Syrian living in Allepo, the focus is dodging the Russian bombs. Global warming, however concerning, is a minor consideration for them, it will wait.

I don't yet see what technology will come out of sending men or menesses to Mars will contribute to solving the privations of Global Warming.
Terra-forming is all very well on another planet when the only consequence of mistakes is a few human deaths but who is going to risk a different kind of tinkering with the air we breath? Trump maybe - he is stoopid enough to think of it.

I personally think mining asteroids has a better chance of pay-off, once we figure how to keep a lander glued to an irregular surface in virtually zero G.

It is all about profit. However that is measured.