liability where responsibility for environmental damages caused by a productin production, use, or disposalis borne by the producer; economic responsibility where a producer covers all or part of the costs for managing wastes at the end of a products life (e.g. collection, processing, treatment or disposal); physical responsibility where the producer is involved in the physical management of the products, used products or the impacts of the products through development of technology or provision of services; one common expression of this would be ownership where the producer retains ownership of the product over it entire service life, and