Yes, ruining the planet even more sounds like a fantastic idea.
That would be a horrible idea. Not only would a Mars mission blaze the way for a bunch of new technology, but like dzmax implied, it wouldn't be hurting our environment.
You know how much energy it'd take to build and maintain comfortable living conditions in the Antarctic?
I imagine the resources required to facilitate a mission to Mars would still be very damaging to the environment. I often wonder how much we kill our planet every time we send a rocket into space.