NOVELTY - The method of treating municipal and selected commercial waste e.g. plastics to produce an environmentally acceptable fuel, comprises shredding the waste to a first particle size ( less than or equal to 100 mm) and a second particle size ( less than or equal to 50 mm), storing the shredded waste in an aerated storage bay (14) for 72 hours, agitating the shredded waste in a rotating drum for 48 hours and then outputting the treated waste, controlling airflow through the storage bay such that the shredded waste is maintained at 50 degrees C, and periodically applying a heating- and a cooling cycle to the waste.    USE - The method is useful for treating municipal and selected commercial waste such as paper and card, plastics, textiles, glass, metal, garden waste and kitchen waste to produce an environmentally acceptable fuel.    ADVANTAGE - The method is capable of economically and effectively treating the municipal and selected commercial wastes thus avoiding the harmfulness to the environment, and ensures reduced anaerobic microbiological breakdown of the organic matter thus preventing emissions of greenhouse gases and the contamination of valuable water resources.    DETAILED DESCRIPTION - The method of treating municipal and selected commercial waste e.g. plastics to produce an environmentally acceptable fuel, comprises shredding the waste to a first particle size ( less than or equal to 100 mm) and a second particle size ( less than or equal to 50 mm), storing the shredded waste in an aerated storage bay (14) for 72 hours, agitating the shredded waste in a rotating drum for 48 hours and then outputting the treated waste, controlling airflow through the storage bay such that the shredded waste is maintained at 50 degrees C, periodically applying a heating- and a cooling cycle to the waste, and feeding the treated waste from the rotating drum into a rotary dryer (20) for a period of time and heating the treated waste at 90 degrees C to reduce the average moisture level. The municipal solid waste is sorted to remove non-combustible material from the waste before shredding the waste. Biological decomposition under aerobic conditions takes place in the aerated storage bay and the rotating drum. The average moisture level in the shredded waste is reduced to 35-40 wt.% and 20-25 wt.% after first and second time periods respectively by metabolic heat generation. The waste is exposed to a first and a second airflow rate at a time when the rotating drum is stationary and rotating respectively. The duration of each heating cycle and each cooling cycle is controlled such that the waste in the rotating drum is maintained at 40-55 degrees C. An INDEPENDENT CLAIM is included for a system for treating the municipal waste.    DESCRIPTION OF DRAWING(S) - The diagram shows a flow diagram of the system for treating municipal and selected commercial waste.    Disposal area (10)    Bag splitter (11)    Primary shredder (13)    Storage bay (14)    Rotary dryer. (20)