"A PB&J will slow global warming. Next time you have one you'll reduce your carbon footprint by saving 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. That's about forty percent of what you'd save driving around for the day in a hybrid instead of a standard sedan. If you were going to have a ham sandwich or a hamburger, you save the equivalent almost three and a half pounds of greenhouse gas emissions. A PB&J also saves about 962 gallons of water over the hamburger. To put this in perspective, two PB&Js a month instead of hamburgers will save about as much water as switching to a low-flow showerhead. Have a PB&J and save 12 to 50 square feet of land from deforestation, over-grazing, and pesticide and fertilizer pollution.