This year's Clean Up the World (CUW) weekend activity of Los Banos was held on 19 September 2009 (Saturday). Around 36 million volunteers in over 120 countries took part in this simultaneous cleaning up event.  Community groups, schools, governments, business and individuals got together in order to clean up local parks, streets, waterways, coastal areas and educate children and the general public about the environment and address causes of climate change. CUW weekend was held in partnership with the United Nations Environment Programme with the Australian Government, through its Department of Foreign Affairs and Trade as the main supporter.