As long as we're being silly, here's another: Areophany.

Terraforming Mars isn't impossible because of what EP says - well, maybe it is, but who cares? It's impossible because it'll never be tried. Never. Y'all have fun calling each other names and trying to shout each other down... Every last one of us will be dead of overripe old age before a human makes a footprint on Mars, so it doesn't mean shit.

Most likely, manned settlement will never happen. But if it does, the planet will change its settlers. Mars is not like Earth, and never will be.

Mars is like Mars. Keep it that way.