Also impractical. We have not found a single planet (or moon) that is viable. Also, we don't know how to send one person to mars, let alone mass migration to a planet around another star.
There is something profoundly unethical about the idea that we just discard our planet after we’ve done so much damage and then go without having learnt anything and think that we’re going to overcome the problems we weren’t willing to do on our own planet https://buff.ly/2pjlj37 pic.twitter.com/eP7ofeFY5R
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