From The Lexicon of Sustainability:

weeds + trees + crops + critters + soil = An integrated food web allowing biota to self-regulate = (no pesticides needed) An integrated self-regulating, multi-layered food-web that requires little maintenance and no pesticides.

Small, organic farms like Rick Knoll’s are able to eliminate their reliance on petrochemical-based fertilizers and pesticides. The results are fewer pollutants, less environmental degradation, and cleaner air. And by using cover cropping and other soil fertilization principles they are able to sequester carbon and keep topsoil—which is carbon heavy—from being lost into the atmosphere, which also contributes to climate change.