Greyfox writes "Lately I've been seeing the obnoxiously smug "Please consider the environmental impact before printing this Email" in the signature of a number of people who send me email far too regularly. This really makes me want to print their email, cut out the signature, and start making a "Please consider the environmental impact before printing this Email" rug out of signatures and tape. But it got me wondering, what exactly IS the environmental impact of printing their email? And what is the environmental impact of their sending me their generally useless trivia at all? I googled around a bit but couldn't find anything useful. Could someone point me to a study on this?"