Soil, one of nature’s most complex ecosystems, is often taken for granted, but vibrant soil ecology, which is under assault all over the globe, is ultimately essential to planetary and human health. With: David Montgomery and Anne Biklé, co-authors of The Hidden Half of Nature: The Microbial Roots of Life and Health, which explores how the soil microbiome influences the human biome and the analogies between soil and gut ecologies (read an excerpt of The Hidden Half of Nature here); Dale Strickler, leading agronomist, author of the Drought Resilient Farm.