Okay so heres a scenario for you:
It's 2045 by then we have spaceships capable of travelling the distance of a far off planet within 3 years there and back. Astronauts arrive on Planet X and discover a human like form that is heavily unevolved and very similar to the form of cavemen here on earth. What do you think the consequences of choices that Earth would make, would we consider these lessers as obviously they wont have the means to communicate and will take to us as predators/food is it ethical to kill them off for our mistakes on Earth so that we can have a chance at restarting. Is it to tempting for us to leave them to their own and take our own crash course?
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