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
Climate change in the United States produced 6,930 mt (15.7% of the world's total). In the cumulative emissions between 1850 and 2007, the U.S. was at the top in terms of all world nations, involved with 28.8% of the world's total. China's emissions have outpaced the U.S. in CO2 from 2006 onward. The U.S. produced 5.8 billion metric tons of CO2 in 2006, compared to the 6.23 billion coming from China. Per capita emission figures of China are about one quarter of those of the U.S. population. The single largest source of greenhouse gas emissions in the U.S. is power generation. For example, data from 2012