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I suppose all of you guys have a pretty good idea about how hard would be to make Mars able to sustain life or at least make possible walking on its surface without a space suit, but for the sake of remembering here is an interesting video on the subject:
https://www.youtube.com/watch?v=9F1iWp4Gl3k
Yukito's "baldachin" is an elegant solution for most of those problems, however there are two that he haven't adressed and are very very hard to overcome: Mars low gravity (remember that long exposition to low gravity is harmful for human beings in many ways) annnd... something else that only recently I discovered: like Moon's dust, the dust on Mars is very harmful, even poisonous, to us humans. Here's a video on the subject: https://www.youtube.com/watch?v=_Ao7to4WrMc So enven under a baldachin that holds the atmosphere and protects from radiation levels far greater than those on Earth, it's very unlikely the sight of little Alita and Erica running around on a nice desert like surface because nothing is nice in Mars, any of Earth's deserts is far more pleasant than Mars surface. By the way, "The Martian" is a nice movie but is inaccurate in spite of trying really hard to make things plausible.
Sorry if someone else has brought the subject before and I'm just annoying you (again), in this case, feel free to delete, O almight mods.

This has already been commented, some years ago, but I cannot see reasons to delete your post.
Anyway, as I had said before, twenty-and-some years ago, Carl Sagan had a TV series (I cannot remember the name) in which he gave a full explanation about terraforming Mars. As far as I can remember, it would take about 100 terrestrial years, but then we would have forests and even seas/beaches on the planet. I really cannot remember if he said something about the soil, but I certainly remember he insisted that the planet would be ready to receive terrestrial lives. Terrestrial, and not only human, as we have a very complex environment to share with other species, and biology makes clear that an only-human world would be unviable.

Sergio Nova wrote:This has already been commented, some years ago, but I cannot see reasons to delete your post.
Anyway, as I had said before, twenty-and-some years ago, Carl Sagan had a TV series (I cannot remember the name) in which he gave a full explanation about terraforming Mars.

The name of that series is Cosmos, it was aired in 1980, it's a classical but now is outdated, there is an updated version aired in 2014 and presented by astrophysicist Neil deGrasse Tyson. I haven't watched all the episodes of the new series and obviously I can't remember the original in details (in spite of that I have both series in my HD). The dust problem is based on the latest data collected by NASA's rovers https://en.wikipedia.org/wiki/Mars_rover and I think it's the greatest problem to overcome in colonizing Mars.

As i pointed back in the previous topic, the main problem is martian low gravity, which is, if i'm not wrong, 30% of Earth's, so, basically, a little more the Moon's, which is 20% Earth's. And that's an unsolvable problem.

Kishiro clearly stated that some of the solar system's moons have been dismantled to terraform main planets (yet, Mars surface looks just like it is now, in his panels), and that would make sense in order to increase a planet's gravity through increasing it's mass.

But then, with an increased mass a planet would run away from it's orbit, probably closer to the Sun and who know what would then happen? Collision with Earth or Venus? Collapsing orbit that throws the planet directly into the Sun? A new stable orbit? Everything could happen. And what about Phobos and Deimos?

If I understood what you said, the problem is not unsolvable, once the mass was increased to increase gravity.
As to Phobos and Deimos, in Last order phase 1, we learnt that they are still there.

We don't know if moving a mass big enough to increase Mars gravity is in the reach of the level of technology shown in Gunnm plus where that mass could come from? Perhaps the biggest asteroid, Ceres, about 1000 km across would be enough, however making Mars and Ceres collide would turn Mars on a magma ball for millions of years. And Mars dust is very harmful as I said before, one person will be dead within a few months.