The announcement of Sweetgreen salad chain that it’s adding beef to its menu led to strong reactions online, with customers questioning the company’s carbon neutral plans. Beef production is resource-intensive and a contributor to climate change, but Sweetgreen says “regenerative farming” and purchasing carbon offsets will keep the restaurant on target. Other fast-casual chains have also made promises to combat climate change and reduce their greenhouse gas emissions using a variety of other practices. Experts say not all of these practices are effective.