This should not be needed to be said, but should just be done. Double side your paperwork. At school we have a lovely printer that double sides things. I would always print off my items on both side, and they even had a sign up telling you to. They finally got around to making the default printing that way, and now you have to work to get things to only print on one side.
Even better than printing on both sides is to print two pages on one side. If you have good eyesight, which is most people, two sheets per side will still be readable. PDF's can be printed this way, and if you go into the properties before you print off of other programs you can select this options as well. It is worth looking into.