Found this on the Futuretimeline forums, very interesting indeed. This shows the terraforming of Mars and approximately the price of the whole process. Of course this would take a long time, or at east 300 years to undertake the whole process (but who knows, it's too early to tell).
What is Terraforming?
[Full Size]terraformingpresent participle of ter·ra·form
(esp. in science fiction) Transform (a planet) so as to resemble the earth, esp. so that it can support human life.
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Little-bit more about Terraforming of Mars @ Futuretimeline.net.
http://www.futuretimeline.net/22ndce...-2149.htm#mars
http://www.futuretimeline.net/the-fa...rs-terraformed