World on the brink of oil war as Opec bickers over price

Some members, led by Iran, have called for immediate action to stem the drop in oil prices, while the Arab sheikhdoms of the Gulf have so far argued that it could be another three months before it becomes clear whether the group should cut production for the first time since December 2008.

...

In the US -- the world's biggest consumer -- crude for November delivery at one point last week dropped below the psychologically important $90 pricing level, raising fears that a prolonged slump could put many of America's shale drillers out of business. Shale oil, which can cost up to $80 per barrel to produce...