http://ljsheehan.blogspot.com  While many cattle are stuffed full of grain, grass-fed cattle have been heralded as a greener way to get beef because it diminishes the need to feed the animals antibiotics and has a smaller carbon footprint, not to mention that it yields beef with less saturated fat. Those of us lucky (or wealthy) enough to feast on grass-fed beef can rest easy knowing we have taken a step toward protecting planet Earth—or so we thought. It turns out there’s a hitch: