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Mars can and should be settled with Earth émigrés. For our generation and many that will follow, Mars is the New World. Exploration, settlement, and colonization are inherent in the human spirit. We earthlings must reject misleading prophesies such as the Malthusian fear that we are running out of resources on our planet. Resources abound off-Earth in space. Humanity's potential for growth is unlimited. Failure to terraform and colonize Mars would constitute a failure to live up to our human nature, and a betrayal of our responsibility as members of the community of life itself.
Robert Zubrin (Thu,) studied this question.