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One would have to weigh in so much, that I'm pretty sure it's not doable in one rather lousy afternoon. To be really sure of this you would need to hire a trustworthy (and, mostly, costly) number cruncher company.
The iLiad from iRex actually uses "easy on the environment" in their overview. But, of course, there is no source included.
You would have to go with your guess.
I would, however, not be surprised if an agency already calculated this. There is always the chance that companies very much like iRex, Cybook, Sony would want this worked out.
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