On a reader - if you're counting the cost of electricity, let's count the cost of shipping entire forests of paper around the world, first to paper mills, then to print factories, then to bookshops and libraries.

And the cost of travel to and from a lending library for every reader.

And why not also include the cost of lighting to read the book? (I can read my Kobo in the dark because it has a very low energy backlight. My eyes don't work so well with the lights off, so I've never been able to do that with paper.)

I wonder how many people here understand that giant warehouses full of overstocked print are regularly shipped back from stores and pulped. Does everyone understand how much space and weight a million copies of a failed bestseller takes up? Does everyone know that paper books are always sold sale-or-return, so if they don't go out the front door they go out the back door onto a truck, with the covers stripped so they can't be resold?

The original article is factually wrong in significant ways.

Not all ebooks are sold by Amazon, not all ebooks have DRM, and not all ebooks that start with DRM continue to have DRM.

At this point, arguing against digital publishing because Amazon is like arguing against the printing press because the medieval Catholic church was fond of censorship and burning.