1) Past civilizations have failed due to soil degradation from lack of protection, leading to loss of productive land, impoverished populations, and declining food and water quality. 2) Healthy soil with high organic matter is Earth's largest potential carbon sink but many agricultural soils are currently carbon sources; regenerating soils through cover crops and plant diversity can repair the carbon cycle through biosequestration. 3) Maintaining year-round green cover, encouraging soil microbes through compost and minimizing chemicals, and increasing plant diversity will rebuild soil carbon and nutrients, improving water quality and climate change mitigation while increasing food production.