Former Shell chairman says that diminishing resources could push price of crude to $150 a barrel

Lord Oxburgh, the former chairman of Shell, has issued a stark warning that the price of oil could hit $150 per barrel, with oil production peaking within the next 20 years.

He accused the industry of having its head "in the sand" about the depletion of supplies, and warned: "We may be sleepwalking into a problem which is actually going to be very serious and it may be too late to do anything about it by the time we are fully aware."