The general idea is that ecosystems consisting of grasslands with herds of large herbivores are better than any others at rapidly fixing carbon and building ric

The general idea is that ecosystems consisting of grasslands with herds of large herbivores are better than any others at rapidly fixing carbon and building rich soils, significantly more so than forests. The way this works is that grasses have very dense root systems and grow fast, especially when they are being cyclically grazed down to a stub (but not totally removed... goats don't work here because they don't leave enough). The herbivores in turn process that biomass into high-quality fertilizer and spread the micronutrients around by migrating between areas of different soil composition. The result is that the top few meters of soil are filled with a mixture of living and aerobically decaying grass roots, creating relatively stable humic compounds which serve as long-term carbon storage. There is quite a bit of evidence for that theory... it's not completely uncontroversial, but people who have tried it in practice, i.e. raising cattle by the Voisin method or using Alan Savory's "Holistic Management" or similar approaches, usually swear by it, and theoretically it makes makes enough sense to warrant further investigation.