(Reuters) – France’s Tereos, the world’s second-largest sugar producer by volume, posted a strong rise in annual earnings on Thursday, helped by high sugar and ethanol prices and good returns in its starch business, but warned its debt could rise next year. Tereos said adjusted earnings before interest, tax, depreciation and amortisation (EBITDA) for the year ending March 31 rose 46% at constant exchanges rates to 682 million euros ($730.63 million), reaching its target of 600-700 million euros EBITDA six months earlier than planned. The cooperative group has, however, been shaken by repeated …