Dirty surroundings can lead to diseases like cholera and dengue. Burning and recycling can be used to control waste disposal problems. Huge furnaces used to burn garbage are called incinerators. Garbage collectors collect waste generated at homes. Incineration turns waste into ash and releases harmful gases. Garbage refers to useless things no longer needed. Biodegradable waste becomes part of the soil. Compost pits are reusable. Using fewer things is called reducing. Malaria is caused by mosquitoes.