Green Earth Compostable bags decompose completely in both home and commercial composting facilities, leaving only nutrient-rich humus, water, and CO2. Green Earth sources GMO-free crops to make all compostable products. They are certified under the BPI’s strict ASTM D6400 specification in the USA. Also certified OK Compost Home, a European standard for 100% compostability in both industrial/municipal and home/backyard composting facilities.