I thought you meant all textbooks, my bad. If this is just about high school then I mostly agree wrt to the amount of waste.
I think the solution would have to come down from the top however, in the UK at least the way our exams are marked means using an old textbook could be a fairly dangerous affair without an astute teacher (due to the ridiculously anal markschemes and philistine syllabus, this does bite people)
