And there's actually something you can do about it. In the last paragraph of his article, "Think Before You Eat: The Widespread Effects of Factory-Farmed Meat," Brian Colleran quotes Paul Shapiro of the Humane Society’s Factory Farming Campaign:
“The silver lining is that this is one of the easiest ways for individuals to reduce their environmental footprint. Whereas switching to a hybrid car or worrying about coal stacks may be beyond our daily means, choosing more plant-based meals is something where we can stand up for animals and the environment every time we sit down to eat."And a can of beans--or, if you're so inclined, a whole bag to be soaked and boiled--is a whole lot cheaper than a slab of meat.