Back? Did it change?
It's geography suggests that Gorgoroth was pretty arid to begin with. It was a plateau, meaning that water from the Sea of Núrnen couldn't get there, and Ephel Dúath and Ered Lithui must've done a great job stopping rain from coming from the Sea of Rhûn or Ethir Anduin.
By the maps, we know that Gorgoroth had no major rivers flowing through it, although Nurn had four. As I said before, Nurn probable was fairly fertile. I don't think that pure evil transformed Nurn, so it didn't need to "get back" to being green.
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