Well assuming I would be sponsered to favor pBooks I could draw upon how much energy costs / environment damage an eInk device does on production and as waste after its life, assuming a 4 year lifetime (and yes sorry since the batteries for e.g. the iLiad are not exchangeable, you need a new device after 500-1000 recharges...) and explain how this devices will make more environment damage than all the p-books, if all people would switch to eBooks.. So this is not only a marginal question what one additional book would cost, but a question if no eInk device would be produced at all. Look you got the screen, you got the CPU, you got the battery... at least 3 things that are not very environment friendly to produce..
eBooks have far more advantages that just possibility of environement safes and I can understand very well that the big producers dance around to market eInk devices / eBooks as environment safers...
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