There seem to be some underrated practicalities in moving people to Mars that I would look forward to discussing or finding more about. On Mars there is neither water nor air. This article refers to 'atmosphere' but no human can survive breathing carbon dioxide.
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There's water under the ground of the mars, and there has been a special machine constructed to create oxygen.
Elon Musk explained these processes in great detail, so please check out his original speech (the presentation is over 1 hour long) on youtube, I'm sure it will answer all your questions!