You can get any thing these days, an eco bag, an eco lunch, why not an ec font. Apparently it saves ink and obviously your money. The cool thing about it that it can be downloaded for both Mac and PC (sorry don't remember about the Linux). The ecofont website provides clear instructions on how to install it and if such a technical misfit as me can install so can anyone. I find it quote cute and you can't really see the white dots on the printed stuff unless the letters are really large. Another way to do your bit and this time it is actually practical.
You can get the ecofont here.