While it's not the first time that an argument has been made for colonising Mars, in this essay by Jordan Bates he explains how "scientific evidence suggests that there is no more promising branch of evolution than our own" and it is our responsibility to do everything we can to make sure that it continues.
[...] mankind is presently in an immensely powerful and precarious position. We are at the forefront of a branch of evolution that began on Earth ~3.5 billion years ago. Over countless millennia, life has diversified and complexified, giving rise to millions upon millions of distinct species—unique expressions of life and complexity, as well as unique apparatuses through which the universe experiences itself in novel ways.
If we assume that the universe “prefers” complexity, then our Earth has been a veritable diamond mine. For all we know at this time, Earth has given rise to the most sophisticated life-forms in the universe. Our present body of scientific evidence suggests that there is no more promising branch of evolution than our own. If allowed to continue, our earthly branch will almost certainly give rise to multiferous untold wonders—inconceivably complex expressions of human and post-human life and technology. Our branch of evolution, if it persists, may well result in intergalactic civilizations of superintelligent beings which we cannot presently fathom.
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