Eric Farley, of the Boys and Girls Club, sears a piece of grilled pork at the World Championship Barbecue Cooking Contest, Friday, May 17, 2024, in Memphis, Tenn. (George Walker IV/AP) Our love of the iconic American meal — the hamburger — may have implications for the environment. Michael Grunwald, author of “We Are Eating the Earth: The Race to Fix Our Food System and Save Our Climate,” argues that agriculture is a massive and overlooked contributor to climate change.