Construction and demolition (C&D) is one of the many types of waste streams that include municipal waste (household wastes), shipping and boating waste, and commercial/industrial waste. C&D waste is the waste produced during new construction, renovation, and demolition of buildings and structures. This includes building materials such as bricks, plastics and vinyl, carpet, brick and rubble, glass, metal, asphalt roofing, concrete, damaged wood, scraps of insulation, nails, electrical wiring, and rebar, as well as waste originating from site preparation such as dredging materials, and tree stumps. C&D waste may contain lead, asbestos, or other hazardous substances. For example, C&D wastes such as plasterboard are hazardous once broken down in landfill as they release hydrogen sulfide, a toxic gas.