Just going on science, and i believe this could be applicable to Mordor, there is something called Primary and Secondary succession which is the return of plants and soil to an area devastated by a natural disaster. I think it would be evil for some time but eventually creatures and plants from Ithilien would make their way into Mordor.
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"One more soldier dies, and when he gets to Heaven, to St.Peter he will tell, one more soldier reporting for duty, I've served my time in Hell."
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