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It depends on what you mean by "destroy." Sauron was interested in commanding everything, not burning it to the ground. Forests might all be used to fuel the fires of Mordor and other beautiful pieces of nature ravaged for the sake of his needs but consider the fate of everyone in the East who apparently served him. They were all living fine and dandy under his rule for long stretches of time.
Sauron just isn't the mass slaughter type. Recall what is said of him iNnThe Silmarillion in the Second Age - that EVERY creature upon Middle-earth save Elves marched in his host. If nothing else, Sauron is content to let things live and maybe even thrive so long as they live and thrive under his rule.
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