[Frances_Marion]

I think Mars should also commit to the Kyoto Treaty and curb their Martian emissions, because the martian polar caps are starting to melt as a result of global warming. Gee, you don't think solar activity has anything to do with this?? NAHHHHHHHHHH! (sarcus maximus)

[RightWhale]

I know you're kidding, but here's this:

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Earth on Mars: Greenhouses on the Red Planet

An overview of the status of plans for settlements on Mars from the agricultural viewpoint.