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Ecological: 1. The highly visible portion of solid waste carelessly discarded outside the regular garbage and trash collection and disposal system. 2. leaves and twigs fallen from forest trees. (Source: EPA)
 Pets: Cat litter is one of any of a number of materials used in litter boxes to absorb moisture from cat feces and urine, which reduces foul odors such as ammonia and renders them more tolerable within human dwellings.
Several kinds of cat litter are commercially available, enabling consumers to decide which factors are most important. Some cat owners are concerned about litter being tracked throughout the house, while others may look for litters that are biodegradable. Absorbency and odor control are other considerations. (Source: Wikipedia)
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