Canadians in China population of 200,000 are from Canada (20,000). The Canadian diaspora in Beijing is a young and well-educated community and is economically active. A significant number of them include Chinese Canadian returnees who emigrated to Canada in the early 1990s and later returned to China. According to local official statistics, the numbers of Canadian citizens residing in Shanghai have increased significantly over the past ten years. In 2000, the city reported 1,361 Canadian citizens living there, representing 2.3% of all foreign residents in the city. By the end of 2009, there are about 6,121 Canadian citizens living in Shanghai. Shanghai's Canadian
Water supply and sanitation in China built in the city of Nanjing. Subsequently, China engaged in what is possibly the largest wastewater treatment investment program in history. It has been estimated that in 2006 there was sufficient capacity to treat 52% of municipal residential wastewater. According to the State Environmental Protection Agency the rate of urban wastewater treatment reached 57% in that year. The government's goal to achieve a level of 60% for treatment of municipal wastewater by 2010 was surpassed. By 2010, 77.5% of domestic waste water was treated. Between 2001 and 2004, the number of cities that charge wastewater tariffs has increased from 300