I'm actually curious about this point. I wonder about the actual environmental comparison between, say, going through 3-4 notebooks a year vs. a tablet with a 3-5 year span. A notebook "costs" trees, and in theory is use-once and disposeable, but it's biodegradable, the ingredients are relatively easily accessible, and the manufacturing process is pretty refined by now. A tablet, on the other hand, has a whole world of exotic and toxic materials and manufacturing, doesn't break down nearly as cleanly in the end, and costs energy along the way...