Composted material or waste is less bulky than the original material, and much easier to handle. During the composting process, carbon dioxide and water are lost in the atmosphere and the size of the pile decreases by 30–60%.Composting reduces in the decline of nitrogen availability that commonly occurs when organic materials, such as sawdust or straw, are added directly to soil. Composting is also useful for recycling kitchen waste, leftover crop residues, weeds, and manures.
Composting is a natural way to recycle certain food or yard products. It is also a sustainable way to enrich the soil for plants to grow in.
According to the Environmental Protection Agency (EPA), food scraps and yard waste make up more than 28% of waste in landfills and combustion facilities. Composting can reduce the amount of food a person wastes or throws up in the trash.