Something farmers who are now inherently dependent on synthetics forgot is that plants can form soil on their own. Plants use deep root systems and can send up to half their glucose into the soil to build up organic matter in the soil. Bacteria and fungi digest the glucose and create small pores in clay soil which lets water infiltrate instead of washing nutrients away at the top. Droughts are rarely the result of a lack of water, they are the result of poor water retention.

The point is that plants are capable of terraforming the planet on their own. It isn't even a slow process if humans help the plants do their job.