Urbanization in China or 37 percent of the total population in the mid-1980s—was relatively low by comparison with developed nations, the number of people living in urban areas in China was greater than the total population of any country in the world except India. The four Chinese cities with the largest populations in 1985 were Shanghai, with 7 million; Beijing, with 5.9 million; Tianjin, with 5.4 million; and Shenyang, with 4.2 million. The disproportionate distribution of population in large cities occurred as a result of the government's emphasis after 1949 on the development of large cities over smaller urban areas. In 1985 the
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