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> If it possibly might end badly, it must never happen out of lab.

There are many different ways and degrees of "badly". What you you thinking of when "ending badly" is mentioned? How accurate and likely is that an outcome? Is it based on knowledge of possible outcomes based on the science, and extrapolations, or on popular science and/or cultural depictions, or something else?

For many possible outcomes, we have real data. We have many cases of a species being removed from an ecosystem, and of a subspecies being removed. Some of those are because of humans causing extinctions (or near extinctions), some of it is from humans causing the removal of a species from an area, and some of it is from natural change in ecosystems that is not the cause of humans (the world is not static, species evolve, evolutions and natural phenomena such as weather patterns allow species to spread to new areas).




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