The insulating concrete formwork system uses expanded polystyrene as the formwork for in-situ concrete structures. The formwork is left in position to provide high levels of thermal insulation. It has been estimated that use of the system could reduce UK carbon dioxide emissions by 45,000 tonnes over a five-year period. The system provides great architectural flexibility and can be used to produce high-quality, affordable homes. The technique is little used in the UK (300 homes in 2002), but is predicted to gain in popularity. The Insulating Concrete Formwork Association was officially launched on 5 September 2003.