> even after a nuclear Armageddon or the zombie apocalypse, Earth will still be more habitable than Mars for humans Yes, but we don't live in radiation-hardene

> even after a nuclear Armageddon or the zombie apocalypse, Earth will still be more habitable than Mars for humans Yes, but we don't live in radiation-hardened bunkers on Earth. The effect of a Martian environment on Earth would be billions of deaths and the total collapse of society. The effect of the Martian environment on Mars is...people have to wear space suits. One is a normal state of affairs, and the other is a cataclysmic event that society is not prepared to survive.