Rising non-Opec output is capping the demand for Opec crude,prompting Opec to review plans to expand capacity.But non-Opec forecasts may be too optimistic.Non-Opec supplies are up sharply after two years of disappointment and delay,as a series of major upstream projects finally make their presence felt.Crude production outside the 10 Opec countries that agree output limits is up by 1.2mn b/d in the first five months of this year compared with the same period a year ago.
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