Cows?? You should see me after a trip to Taco Bell!When I talk about being healthier for the planet, I'm referring from a global warming perspective. Cows, specifically are terrible for the planet with the amount of methane they produce. When you add in the cost of crops required to feed them, gas to bring feed to them and then take them to market, etc... they're statistically terrible and cutting those out of our diet completely would cut back on Methane immensely (Which is about 1/3 of the cause of global warming) which also removes itself very quickly.
With that said, I'm not kicking and screaming for it. I'd be a terrible vegetarian. However scientists do tell us that if every human would make one day a meatless day that the results would be pretty dramatic.