Guardian: Gloibal demand for oil in 2009 will fall by the largest amount for 25 years, according to the chief energy economist of Deutsche Bank. Adam Sieminski said oil prices could hit a low of $30 a barrel next year, a fall of a quarter from today’s price, because of the sickly global economy. He forecast an average price of $47.5 for the whole year for oil traded in New York. Deutsche Bank predicts global demand will contract by 1 per cent, or 1 million barrels a day, three times the fall …