Each year, more than two million tons of cat litter, or approximately 100,000 truckloads, ends up in landfills in the U.S. alone. Primarily this is not biodegradable or renewable and adds to the waste burden. Some pet owners prefer biodegradable litters due to its friendliness to the environment. Biodegradable cat litter can also be eliminated completely by safely composting the used litter at home. Other cat owners can be attracted to the biodegradable litters because of their flushability or deodorizing properties. Some pets, such as those with asthma or sensitive senses of smell, may also benefit from the reduced dust in some forms of biodegradable litter.