Oh god, that's just one problem with it.

First of all, there is no such thing as "100 times fewer". "X times" means multiplying by something. What they mean is that a book is responsible for one hundredth of greenhouse gases compared to an eReader.

But linguistic pedantry aside, I can't make the numbers add up.

65 pounds is 30 kg. Assuming these figures are correct, it means that an eReader produces only 4 times as much CO2 as a book (30 kg vs 7.5 kg). What are these CO2 emissions caused by, the power consumption? Apparently not, because they say the kWh needed for one eReader is 50 times that for a book, but the emissions are only 4 times larger. So it must mean that these emissions they talk about come from some manufacturing process other than power consumption? Let's calculate the emissions of power consumption then.

Electricity production on average releases 0.59 kg of CO2 per kWh generated^[1]. This means that an eReader with its 100 kWh consumption is responsible for 59 kg of CO2, while a book with its 2 kWh is responsible for 1.18 kg of CO2, just in electricity consumption.

If we add this to what I assumed are other sources of emission (30 and 7.5 kg), it means that there's 59+30=89 kg of CO2 for an eReader and 1.18+7.5=8.68 kg for a book, which comes up to eReader producing around 10 times the CO2 compared to a book.

How did they get the "100 times fewer" figure? I'm genuinely asking someone to check this, because I'm not very good at math and it's possible that I'm missing something, but the fact that they are comparing lbs with kg in the first place makes me more certain in my abilities than whoever made that infographic.

[1] according to this page I found on Google