Beneath the turquoise waters of a remote Pacific atoll, a Japanese warship sunk more than 80 years ago has begun leaking fuel oil, threatening ecological disaster.The source of the leak is the Rio de Janeiro Maru, a huge vessel used by the Imperial Japanese Navy as a submarine tender during World War II that was sunk by American bombers more than 80 years ago.Today, as oil streams from its rusting hulk, officials in the Chuuk Islands fear this may be just the first instance of hazardous waste...