Actually, it does matter, grass fed beef should be the rule not the exception.. but takes more space. It'd be better for the bovine, the human, and the planet. Believe Me, I'm no apologist for the way the beef industry has operated for a looong time, and it isn't a large part of My weekly diet...but I do enjoy it in various forms at least 1-2 times/wk.
I am NOT worried that cows are melting ice caps.....