Developing global goals for soil health research and action: report on the "Soil Stars Heligan Summit," The Lost Gardens of Heligan, UK, March 2026.

Soil underpins food production, freshwater, carbon storage and biodiversity, yet over 40% of the world's soils are now degraded, eroding at rates up to 1000 times their formation rate. Microbial technologies have matured and can now aid soil recovery, but deployment has lagged due to absent shared targets, harmonized metrics, and coherent reward structures to mobilize solvers across academia, industry, philanthropy, and government. Building on major initiatives (e.g. A Soil Deal for Europe, the FAO Global Soil Partnership, etc.) a consensus has emerged on the need for actionable, transformative advances in soil health. To translate that consensus into coordinated action, The Soil Stars, a multidisciplinary coalition of scientists, communicators, investors, policymakers, and farming-systems leaders, convened the inaugural Soil Stars Heligan Summit in March 2026 at The Lost Gardens of Heligan, Cornwall, United Kingdom, with a public launch at the Eden Project's Anthropy 2026 forum. The summit combined a grand-missions hack-a-thon with roundtables on the climate-society interface, the soil carbon-fertility-microbiome nexus, and deployment hurdles. The primary outcome is the first draft of the Heligan Grand Challenges; seven XPRIZE-inspired challenges with concrete performance thresholds achievable within 24-36 months, alongside a path toward a formal Grand Challenges paper and five-year implementation roadmap.