Cattle graze on deforested land in the Brazilian Amazon, in the northern state of Para, in the fall of 2009. | Andre Penner/AP It’s pretty much impossible to live a life free of environmental harm. The cleanest energy relies on mining. Critical medical supplies produce plastic waste. Even organic foods are typically grown with pesticides. But there is one thing you could do immediately that would help the planet a heck of a lot: eat less beef.  I know, I know; for most omnivores, beef is hard to give up. The cheeseburger is one of the only truly American foods, and meat-free alternat...

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