Strickler provides a solid foundation in the science of healthy soil, explaining how soil has become so degraded over time and the dire consequences for the human species, not just in terms of food scarcity but also the social, health, and environmental consequences of growing food in poor soil. He addresses the chemical, physical, and biological principles behind soil function, and presents actual farming practices that can be used to regenerate soil, techniques and strategies for remediating contaminated soil, and agriculture systems both past and present that functioned to build soil, such as the ancient chinampas systems of Mexico and the permaculture systems of today.