A: In fact, in addition to composting, compostable materials have other treatments, such as burning. Compared with plastics, the products of complete combustion of polylactic acid are carbon dioxide and water, which are not polluted. It can also be landfilled. Although the degradation rate is relatively slow, it does not pollute the groundwater at least, does not damage the plant growth, and does not waste farmland. Of course, it can be recycled, but the cost of recycling is relatively high.