A volunteer helps to clear algae from the coastline of Qingdao, Shandong province July 5, 2008. China has thrown 10,000 people and 1,200 vessels into the fight to clean up a huge algae bloom that has turned large swathes of Qingdao's offshore waters green and encroached on a third of Olympic sailing waters. REUTERS/Nir Elias (CHINA) (BEIJING OLYMPICS 2008 PREVIEW)