When used as a soil amendment, biosolids supply much-needed organic matter to the ground. Biosolids contain high amounts of carbon and organic forms of nutrients, which are released more slowly than chemical fertilizers. Biosolids are produced with fewer greenhouse gas emissions than chemical fertilizers. Furthermore, a portion of the carbon in biosolids becomes sequestered in the soil matrix after land application. In fact, the State of California’s Climate Action Reserve recently adopted the Soil Enrichment Protocol to quantify agricultural practices that sequester carbon and decrease greenhouse gas emissions. The Protocol includes biosolids as a valuable amendment for such credits.