Yard and garden waste makes up a significant percentage of materials added to landfills. Organic waste materials that are composted will cause fewer landfills to ultimately be needed.
Compost improves the structure of the soil, helping it to better hold water. As a result, less water runs off and more is absorbed by the soil, reducing the need to water with sprinklers or sprinkling system.
Adding decomposed organic matter to the soil in various sizes creates air pockets. These air pockets help plants roots grow easier, resulting in healthier plants. It also improves the fertility of the soil, also resulting in healthier plants. Compost also adds microbes to the soil, benefiting the health and growth of plants.
Plants grown in garden beds with added compost don't need as much chemical fertilizer as those grown in beds without compost. This reduces the environmental cost of manufacturing and transporting the chemical fertilizer, as well as the actual use of it in the garden.