The world will never be able to produce more than 89m barrels a day of oil, the head of Europe's third-largest energy group has warned, citing high costs in areas such as Canada and political restrictions in countries such as Iran and Iraq.

Christophe de Margerie, chief executive of Total, the French oil and gas company, said he had revised his forecast for 2015 oil production downward by at least 4m barrels a day because of the current economic crisis and the collapse in oil prices.