Here one relevant discussion:
http://www.econbrowser.com/archives/....html#comments
There is no real increase, small plus in NAmerica and Opec is compensated by losses of other producers.
For me the question is, can we substitute and save for a longer span of time at the same rate as the available volume of crude, i.e. global production minus demand of China and India, decreases, this was 3% p.a. since 2005.
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