One simple thing (where documents *must* be printed) is to use duplexing and multiple-up settings when printing.
Duplexing is just printing on both sides of the page - some printers support it, some don't.
Multiple-up is printing 2 (or 4 if the text is clear and someone won't have to read the entire document in one go) pages per side.
If you print 2-up and duplex you get 4 pages of writing per sheet of paper and can reduce your paper consumption by up to 75%. Print 4-up and duplex and you can save up to 7/8ths of your consumption. 4-up can be a bit hard on the eyes, but for a document which only requires occasional review or a big manual that you read parts of once and then file away on top of a cabinet somewhere it is grand.
The savings really only become apparent when printing large volumes of paper. If your print runs are normally 1 or 2 pages then you don't save any paper at all.
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