Recycle, recycle, recycle.
That's an even simpler to-follow advice. Just use any paper on the both sides of paper. This can save a lot of wasted paper. Use digital format media instead printed documentation for company handbooks, manuals, rosters etc.
and don't forget to use a fax server instead of a fax machine. This way you will save both money and paper. Simple as that.
Calculate your ROI here.