What's Greener? E-Readers or Print Books?

Dilemma: When it comes to reading, what's kinder to the environment - an e-reader or books?

Of course I'll: Stick with traditional books. Yes, they use paper and ink, but at least I don't need to plug them in.

Trade-off: There are carbon emissions in the production of books too, not to mention the loss of carbon-gobbling trees felled for paper.

Then I'll: Use the e-reader; as much as I read, it's bound to be a better choice over the long run.

Trade-off: At the rate technology evolves, the e-reader I buy today will probably be obsolete within a few years.