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I've only managed to find one report – on the Kindle (by The Cleantech Group) – but it backs up suggestions that so long as e-readers are used as book replacements rather than supplements, they soon start to pay back in carbon terms. The report states that a book uses up "approximately 7.46 kilograms of CO2 over its lifetime" and that the Kindle produces "roughly 168 kg" during its lifecycle, making it "a clear winner against the potential savings: 1,074 kg of CO2 if replacing three books a month for four years; and up to 26,098 kg of CO2 when used to the fullest capacity of the Kindle."