The process of combusting materials. An incinerator is a type of furnace used to incinerate waste organic materials to the point that only ash remains. It is often the case that combustion of toxic wastes such as halogenated hydrocarbons, herbicides, and pesticides are best treated by incineration, otherwise they would persist within the environment over long periods of time. It uses high temperatures in the order of 1,100ºC to 1,300ºC with the combustion of fuel oil or natural gas in an excess of air.