Soil and climate scientist Walter Jehne works to educate farmers, policymakers and others about "the soil carbon sponge" and its crucial role in reversing and mitigating flooding, drought, wildfires, and rising global temperatures. He shows us how we can safely cool the climate and restore essential biodiversity by repairing our disrupted hydrological cycles, returning excess carbon to the soils, where it can build a sponge that soaks up water and revives the biosphere.