The NEW SCIENTIST has a very interesting chart on the longevity of (that is, when we will run out of) key commodities based on various scenarios of consumption rates, population growth and recycling percentages.For example they estimate that there is enough platinum to last about 15 years, silver 15-20 years, zinc 20-30 years. So either we will have to use less, find even more than is projected to be available or see prices rise.
The chart can be seen HERE.
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