Could we really terraform Mars?

The terraforming of Mars, to a world not unlike ours. (Image credit: Daein Ballard, CC BY-SA)

Almost every sci-fi story begins (and sometimes ends) with the terraforming of Mars to turn it into a more hospitable world. 

But with its frigid temperatures, remoteness from the sun and general dustiness, changing Mars to be more Earth-like is more challenging than it seems (and it already seems pretty tough).

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