Oxo-biodegradable are conventional plastic bags which have an additive (usually small amounts of metal salts) that help speed up the degradation process. Oxo-biodegradable bags are not compostable. Neither Oxo-biodegradable plastic bags nor bioplastic bags will degrade in the landfill, as they must be in the presence of both sunlight and oxygen. Cycle Dog chooses to use bioplastic bags made from corn/plant starches, which are a sustainable resource. Unlike oxo-biodegradable plastics, bioplastics generally do not produce a net increase in carbon dioxide gas when they break down.