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It's like the question of a ceramic cup versus a paper cup. The ceramic cup impacts the environment much more when u compare 1 to 1 and this is built into the price as the ceramic cup costs much more.
However, since the ceramic cup is reusable....eventually after so many uses it becomes both more economical and less a lower load on the environment. If the ceramic cup costs $2 to make and the paper cup costs 5 cents to make (made up numbers)....after using the paper cup 40 times...it'll start to be more expensive and with a higher load on the environment (most likely but just an estimate)....might take less than that.
so it is with the ereader. you'd probably have to read 40 books for the ereader to be become green. so it depends on how many books u read and how long u have the device. if u buy another device every year and only read like 20 books....then u are actually making the environment worse most likely
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