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Originally Posted by Yukon Cornelius
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I'm aware you said controlled environment, however you also talked of having the trees letting greenhouse gases into the atmosphere (which was a stupid thing to say as trees absorb carbon dioxide, a greenhouse gas, and turn it into oxygen releasing that back into the atmosphere) which would imply the trees doing more then existing in some bubble where they're ultimately alienated from doing anything to Mars climate. Which they couldn't as they would die as soon as they're let into the Martian environment.
Also an alien plant being able to exist on Mars (if it actually does or did) doesn't mean a tree from Earth could. We know what a tree needs to grow and Mars doesn't have it.