Innovative farmer Joel Salatin says sustainable agriculture requires both perennials (like native grasses) and herbivores (like cattle) to build soil. Mimicking patterns from nature, this maverick Virginia farmer rotates cattle followed by chickens into short-term pasture enclosures, where their poop fertilizes the earth. His new book "Folks, This Ain't Normal" is a critique of the industrial food system, and envisions a future where humans are participants in a regenerative, sustaining community of abundance.