Each time you have a plant-based lunch like a PB&J you'll reduce your carbon footprint by the equivalent of 2.5 pounds of carbon dioxide emissions over an average animal-based lunch like a hamburger, a tuna sandwich, grilled cheese, or chicken nuggets. For dinner you save 2.8 pounds and for breakfast 2.0 pounds of emissions.

Those 2.5 pounds of emissions at lunch are about forty percent of the greenhouse gas emissions you'd save driving around for the day in a hybrid instead of a standard sedan.

If you have a PB&J instead of a red-meat lunch like a ham sandwich or a hamburger, you shrink your carbon footprint by almost 3.5 pounds of greenhouse gas emissions.

You'll conserve water at lunch too! How about 133 gallons of water conserved at lunch versus the average American lunch? To put this in perspective, five PB&Js or other plant-based lunches per month would save more water than switching to a low-flow showerhead. If you're replacing hamburgers, it should take you just three lunches to conserve more water than the low-flow showerhead.

Don't forget the land you save from deforestation, over-grazing, and pesticide and fertilizer pollution: about 24 square feet at lunch.