those who today predict that the earth will soon run out of resources make the same mistake...60 years ago, silicon was for all intents and purposes worthless...today, it is a very valuable and useful commodity.
when a resource becomes more rare, we tend to find others to replace it or new sources...I believe one of these new sources is going to be outer space. Commercial space travel is beginning to take off now. As the prices for certain commodities increase, there will be a significant incentive to bring them back to earth from out there.
>>I believe one of these new sources is going to be outer space.
I agree, though I suspect it will continue to take longer than the enthusiasts predict.