"What troubles me is the repetition sort of ad nauseam is that cattle are inherently problematic for the environment and that the best thing we can do is give up beef," says Hahn Niman. For years, Hahn Niman was an environmental lawyer working with the environmental non-profit Waterkeeper Alliance. As part of that role she was tasked with looking at the environmental impact that livestock, including beef, had on water systems. She looked at the scientific research, traveled all over the country visiting farms, flew over farm operations, and essentially went down the cattle rabbit hole for two years. Her work eventually culminated in the book Defending Beef. Hahn Niman, a vegetarian, also became a rancher herself after marrying Bill Niman the well-known founder of Niman Ranch (which is now owned by Perdue).