 The other place, perhaps we've got some prospect of supplying our needs with metals is of course recycling. Many of these metals, copper for example, lead, zinc, it is possible to recover these from having made the energy commitment to refine the metals, to put them into some object like a car or copper tubing or wire. It can be recovered. Aluminium in cans, we can recover those cans and recycle the metal. Unfortunately, with an expanding population and to some degree an ever increasing demand for those metals, recycling, stopping or mining won't replace our demand. The recycling processes can't keep pace with our demand. It becomes increasingly important and economically sensible to recycle metals in that way, but it won't replace the necessity for mining.