[Future Snake Eater]

I've been hearing about this idea since I was a kid, and it's always fascinated me. However, it makes me wonder if it's even possible. A lot of their theories for raising the temperature on Mars to something tolerable by humans involves global warming practices, something that isn't even proven on Earth--and we have enormous active volcanoes helping us out here, something that isn't available on Mars.

[Crazieman]

The difference being Earth has huge oceans and huge amounts of life automatically regulating what we spew out - its the Sun and its cycles that cause the heating. (We couldn't make a difference unless we really set off all of our nukes).

Mars has an extremely thin atmosphere and no regulation, pumping huge quantities of so called "Greenhouse gases" would actually make a significant difference.