The declaration of the Factor Ten Club states that within one generation, nations can achieve a ten-fold increase in resource efficiency through 90 percent reduction in the use of energy and materials. Obviously, large savings in materials can result in the future if we begin to make products that would last much longer. For example, the resource productivity of concrete indus- try can leap by a factor of five if most of the structures built today would endure for 250 years instead of the conventional 50.