2. Which department uses the greatest amount of electricity or has the largest carbon footprint? - I think the production department use the greatest amount of electricity because it where all the goods are manufactured. In order to manufacture a good, you will need electricity.
3. What can each department do to help combat its environmental issues? - If every department was to manage the way they waste then combating its environmental issues. Recycling is the key to every department problems. If you learn to recycle old goods and paper, you wouldn't waste as much.
4. Why do all managers, and for that matter all employees, need to be aware of environmental issues and ways they can create sustainable MIS infrastructures? - It saves time and money. Plain and simple. If you are able to actively create sustainable MIS infrastructures, not only will it help your business, but it will also help the environment. Its a win-win situation for everybody!