Grist: Q. A lot of people eat less meat as a way of decreasing their carbon footprints. It`s well-studied that some animals (e.g. beef) have a larger footprint than others, but I`ve wondered if different cuts of an animal also have differing impacts. Is cattle demand affected by demand for tongue, bones, and other less desirable parts, or is it mostly driven by demand for steak? Does demand for chicken gizzards increase the number of broiler chickens raised, and if not, would it then be a carbon-neutral...