How much land cover change (population growth) can be tolerated by ‘GAIA’ before irreversibilty takes its path?

Remember, soils and genes can be lost only once (irreversible). Soil losses reduce the planet’s capacity to store essential plant nutrients (all cations) and carbon (humus), both intimately linked to the presence of clay and, thus, intact soils. The number one driver behind this issue is growth in number of and consumption by humans.