Use profile matters a lot. Leaving one of these one 24/7 is a noticeable amount of juice; turning one on for a few hours every few days is probably lost in your noise floor of all the other things you're doing. You also have to consider the processing cost for recycling and the displacement of the new machine and all of its processing and production costs to the environment. You probably do come out environmentally ahead in a lot of scenarios if you take account of the whole picture as a result.