To make Mars habitable for humans we have to terraform it. For those who don't know what Terraforming means, it is a hypothetical process of changing the conditions on a planet to make it habitable for life that exists on Earth, including humans, without a need for life-support systems.
To successfully terraform Mars, we need to raise temperature, have water stably remain in liquid form and thicken the atmosphere.
According to a sarcastic reply by Elon Musk, we can drop nuclear weapons over the poles of Mars to heat it up.
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