He postulates that "Platinum is mostly used for auto exhaust emission reduction and for jewelry and many other industrial usages. Auto and industrial usage takes up about 54% of supply and jewelry takes up about 40%. Most importantly, as the world has to turn increasingly to diesel engines, platinum will become even more important as it cannot (so far) be commercially substituted by palladium in diesel engines for emission control."
Ironically I just read an article on gasoline usage in China and its projection to 2010.
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