I have had a question ever since I heard about this terra-forming idea. Isn't there more problems with getting life to thrive on Mars than just the atmosphere?
From what I have heard the core is solid, no molten material or solid iron core to produce the protective magnetic field that the Earth has. Without that wouldn't the radiation from the Sun fry anything that even attempted to grow?
I also have heard that with the lower gravity there maintaining keeping a decent atmosphere there would not be likely and the planet would loose alot of it into space.
I know there are alot of very highly educated people who have put thought into these ideas and they must have considered these problems. I just wondered what their answers were to the above problems.
I am not real sure about the atmosphere question but the absence of the magnetic field is a major problem.