Not well argued
I usually enjoy your articles Alistair, but you made a couple of sweeping statements without backing them up with numbers.
1. Planting trees in order to print paper is more sustainable than building power stations to power our electronic devices.
Well that rather depends on the numbers doesn't it? How much paper do we need? How many devices are we going to have, and how much power do we need to power them? And we'll still need power to do the printing and create the paper.
2. Books are greener (eg, easier to recycle) than electronic devices.
Again, that rather depends on how many we need through our lifetimes. If we could get people to buy and use just one e-reader throughout their lifetime then a heavily used e-reader may well be greener than thousands of books, however you measure greenness.