We expected beef to be one of the worst offenders, and it is indeed ranked number two among the three foods with the biggest carbon footprint. Cheese, number three, was unexpected, but it is the number one that came as the biggest surprise: lamb! Looking at the fertilizer used to grow the animal's food, the energy needed to process the meat, and the fuel burned to transport it, lamb has a carbon footprint that is 50 percent higher than beef.
This study looked only at conventionally-raised meat, fed non-organic grain and raised in confined feeding operations, so these results don't necessarily apply to pasture-raised, grass-fed animals. Still, this well-made guide is a good reminder that small changes, like skipping meat and cheese once a week, can have a big impact; for a family of four, it's the equivalent of not driving for five weeks.
• Check it out: Meat Eater's Guide to Climate Change + Health at the Environmental Working Group
Are you surprised by these rankings?