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Well, I can personally speak to the issue with rice paddies. Either you burn the excess straw, or you "soak" it so that it slowly breaks down -- and not well at that. So you have a choice of methane or smoke. I'm not as concerned with the methane, though, because most regions that support growing rice paddies would be mostly marsh/swamp anyway. They would be naturally occurring methane producers even if man weren't involved.
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