Consider the building in which you are presently located, and review historical utility bills for the facility. You can obtain these bills from the facility's owner or possibly also from the local utility offices. How much energy and water are used by the building, and what systems within the building need those resources to function? What are the biggest users of energy and water within the facility? What upgrades would provide the most significant return on investment? What combinations of upgrades would offer synergistic effects?