This brief article discusses the environmental impact of using e-readers versus purchasing books, versus getting a library card. As PLA Blog readers probably already know, library books turn out to be the ‘greenest,’ because each time somebody reads a library book, its environmental burden is reduced. This is because its production requires only a onetime resource use, whereas the e-device needs power for each use. Also, paper books can survive hundreds of years and readings; and e-readers likely will have a brief existence.