I’ve heard it said that from an ecological standpoint, that soil health is the basis of life and fertility. As your soil health grows, and fertile layers in the soil grow, the amount of plants it can support grows. Eventually you can only grow so many plants, so nature spreads her bounty upwards and outwards and begins to support animal life. And animal life is essentially the “mobile batteries” of the nature/fertility world. In the end, that “upward and outward” energy will come back to the soil and recharge the system. So you are basically bringing lots of ecological batteries to “recharge” your soil.