Sustainable business practices can be incredibly complicated - if you let them.
Take printing at the office, for example. If you over-think it, you can come up with dozens of things you'd need to do across the entire "supply chain" of printing, things that together would completely and comprehensively "green" your printing. This would include a more energy efficient printer, more environmentally-friendly ink, recyclable ink cartridges, fewer printers across the office, etc.
Or, you could do two simple things right away:
1. Get better paper.
2. Print fewer pages.
Two smart companies (New Leaf Paper and GreenPrint) can get you started.