Have you checked out ecoBrain? The company was started by two families both in the publishing arenas, living in the US and Canada, passionate about the environment and living more green. They offer eBooks and mp3 audio books about the environment and environmentally-friendly living. Not only do they offer electronic books but in doing so they allow new publishers to produce material much more quickly, cheaply, and profitably. They allow employees to work from home and purchase carbon offsets for their business operations. ecoBrain hopes to grow their online community to be the largest provider of educational resources for eco-friendly living.
All content on EcoBrain is in downloadable, digital format, so you can buy green with zero use of forest-pulping paper and only a minimal amount of expended energy.