So you’re saying my F-150 increases the atmospheric density? ;-)
Before you can terraform mars you have to terraform earth. Its much easier to terraform earth and you gain a lot of know how. To do that however, you first need to kill the cost of energy and desalinated water. Both those barriers will be broken in the next ten years. There are a couple of harbingers of this already. The Israelis for example have become water independent byo water desalination—without the benefit of cheap oil like the gulf states. This is a feat of literally biblical proportions. And it goes mostly unnoticed.
I put together this utube to show how this works over time and in the present.
https://www.youtube.com/watch?v=yCo4SKynckE&feature=youtu.be