Waste management practices differ for developed and developing nations, for urban and rural areas, and for residential and industrial producers. Management for non-hazardous residential and institutional waste in metropolitan areas is usually the responsibility of local government authorities, while management for non-hazardous commercial and industrial waste is usually the responsibility of the generator. Solid waste can be disposed to land or oceans. Solid wastes can also be recovered and reprocessed, a procedure popularly known as recycling.