The idea of colonizing other planets, Mars in particular, is already receiving growing interest, attracting investments and moving flows of money (see Elon Musk and Mars mission). I find this situation pretty alarming, it's disturbing that even great minds (i.e. the recently disappeared Stephen Hawking: https://www.telegraph.co.uk/science/2017/06/20/human-race-doomed-do-not-colonise-moon-mars-says-stephen-hawking/ ) consider a more viable solution to colonize other planets instead to find a way to fix the problems in our still habitable earth. I think that is our responsibility as human beings to preserve our planet, instead of acting as an invasive species consuming resources and lands at an unsustainable rate. There is definitely something wrong with the way we are acting nowadays.