Do you want to change the world? Try it one lunch at a time.
Eat one PB&J instead of a lunch made from animal-products and you'll save 2.5 pounds of Greenhouse Gas Emissions - 40% of what you'd save driving a Prius for the day instead of a standard Camry. Give up your hamburger for the PB&J and you're saving 280 gallons of water and 50 square feet of land.