This is a topic that's been debated for years here. It comes down to how many books are read on the device before it goes to recycling and how the user would've gotten books otherwise. If you are in the habit of walking or biking to your local lending library for your books, then I doubt this is greener. If you bought a lot of new books before and didn't pass them on, this is probably a good deal greener. There have been a few studies on the ecological break even point. You might find them with a board search.
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