Do we need a new car or a new refrigerator every ten years? What happens to our PC which is exchanged for a new model every three years? Why do our shoes last only a year or so, while those of our great grandfather served for a genera tion? Are businesses deliberately marketing products in a way which encourages sub-optimal use and induces consumers to buy new products? More and more consumers respond ''yes'' objecting to the business practices which reduce the life span of a product or pay no attention to efficiency in con sumption. The growing concem with sub-optimal use of consumer...