I'm actually wondering just how "green" such books really are. A traditional book, once printed, consumes no resources, and can be made of renewable materials. An e-book, however, must be displayed on a system that requires power, which is currently (no pun intended) produced, in most areas, using polluting technologies consuming non-renewable resources. E-books may actually still be more environmentally friendly; if someone has actual data, I’d love to see it. Just assuming that since “no trees were killed” they are automatically better, however, may not be accurate.