Mars is not in the Habitable Zone actually.. I wrote a paper solely on the inhabitability of Mars... Only about 1/100 of it's orbit is anywhere even close to the habitable zone
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Last I knew, it was riding that edge. With new information, they may have changed the distance that the habitable zone stretches. I could very well be wrong and that Mars is outside of it. Still, even if I am wrongl Mars will not be the desolate snowy playground that OP thinks it should be. lol Thank you for the clarification and new information. :)
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Mars is about .02AU out of the habitable zone, but that is also dependent on the source I used. So me coming at you guns blazing was a little it unnecessary but nonetheless it is JUST outside that zone :P