The refined products and marketing division is responsible for refining and marketing various products such as gasoline, aviation fuel, fuel oil and middle distillates.

FORBES: Exxon Mobil Is Unapologetically Worth $92 Per Share

That means shipowners who wish to ply these waters will have to stop using bunker fuel (the cheap stuff left over once petrol, diesel and aviation fuel have been distilled from crude oil) to power their vessels because burning it produces too much sulphur dioxide, nitrogen oxides and soot.

ECONOMIST: Marine technology: A voyage of discovery | The

The firm said it had also been hit by warm weather, which reduced demand for heating oil, and lower sales of jet fuel as the aviation industry struggled to recover from the aftermath of 11 September.

BBC: Bad news cocktail hits Exxon profits