Pints of Guinness beer are pictured in London, on May 9, 2008. Diageo, the alcoholic beverages giant, said Friday it plans to overhaul its Guinness operations in Ireland in a bid to cut costs and boost production of the distinctive black stout. Diageo, the world's biggest maker of alcoholic drinks, said it would close two breweries and renovate its famous St. James's Gate brewery in the centre of Dublin -- where Guinness has been made for the past 250 years. AFP PHOTO/Leon Neal (Photo credit should read Leon Neal/AFP/Getty Images)