Would it be ethical to Terraform Mars?


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Would it be ethical to terraform Mars. Lets say we are able to build a microbe that would convert all the CO2 in Mars atmosphere and convert it into Oxygen. As well has take any hydrogen on Mars and convert it into water with the newly formed Oxygen. Should we do it? Would it be ethical not just to terraform Mars but to introduce a microbe that would thrive in Mar's limited ecosystem.

I'd love to hear peoples thoughts on the subject.