... differences in emission per capita kept declining in last 40 years. The SD indicator declines from 0.9489 in 1960 to 0.4370 in 2004, and the Theil indicator declines from 0.3491 in 1960 to 0.0629 in 2004. ... countries (and regions) rising rapidly. Meanwhile, some other countries (and regions) in this group were steadily in emitting levels. So the inner-differences are increasing in lower income countries ... Technology, Beijing, 100081, China. 5 School of Management and Economics, Beijing Institute of Technology, Beijing, 100081, China. Abstract In order to find the main driving forces affecting CO 2 emission...