Mark Bittman goes over the history of how we eat and explains what is wrong with the way we eat today. He advocates eating more plants and less animals — both for our own health as well as help prevent global warming. Oh, you didn’t know that raising cattle contribute to global warming? Mark Bittman says “livestock is the second highest contributing factor to atmosphere-altering gases. Nearly one-fifth of all greenhouse gases is generated by livestock production — more than transportation.”