10/16/19: As part of the PBS “Future of Food” series, Mark Bittman visited Iowa to interview growers and discuss sustainable agriculture in an episode released this week.
“This highly mechanized system is depleting Iowa’s topsoil, the most nutrient-rich layer. About half of it has already disappeared. Liebman is researching ways to combat the destruction, by growing something called “prairie strips” — plots of native grasses and wildflowers, planted along-side traditional crops.”- Mark Bittman