He has also given up double cheeseburgers, steak, ice cream, Coca-Cola and Tastykakes, opting for a healthier diet of grains and vegetables.

WSJ: Want to Be CEO? What's Your BMI?

Think of all the energy expended in pumping that water, treating it, spraying it on crops, heating it for your shower, making it into ice, Coca-Cola, paper, and on and on.

FORBES: To Conserve Energy - Conserve Water