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I'd guess they will eventually work out more friendly if you use them long enough.
Paper books are biodegradable and don't consume any energy when in use, but they are physical things that require manufacturing and shipping. I believe paper stock is generally sustainable, but the printing works and trucks still need to consume resources.
Ereaders contain batteries, which are never very good, and probably other non-recyclable materials. They are also physical things that require manufacture and shipping, but in far smaller quantities than books, because you get many ebooks for a single ereader. Sooner or later the saving on the shipping of pbooks will offset the ereader shipping and other pollutants and power consumption. I have no idea how many books you'd need to read to break even. Wasn't there a thread about it some time ago?
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