Actually Mars is a really shitty place to colonize... It has nothing going for it aside from distance, which admittedly is pretty important at this point.
This is by far the most ignorant comment I've read. One of my Astrophysics professors in college was working with Nasa on plans to do terraformation.
http://en.wikipedia.org/wiki/Mars_terraformationBut basically in a nutshell:
Mars has ice on the caps. That's known. What we could do is put algae on the ice caps, which would start to take the water/ice and decompose it into an atmosphere. As that's going on, the atmosphere is forming, the ice will also melt and make some parts of Mars fertile enough for trees. Even if not, get something that requires little water (i.e. cactus/weeds) and plant them so that they can start converting CO2 -> breathable air. If we sent algae today, it'd take about 500 years for Mars to be inhabitable and breathable without needing anything. Today, we could technically be on the surface with an oxygen mask if we were in one of the gorges, so we'd be shielded from UV rays.
Mind you, this is HIS theory and mostly hearsay. The article talks about actually making more use of CO2 -- which also makes a lot of sense.
--Terin