Abstract: Based on latest national CO2 emissions data released from the International Energy Agency (IEA), using the statistical method, the CO2 emission trends for different countries and regions were analyzed. The results show that the CO2 emission of the whole world based on purchasing power parity (PPP) decreased from 1990 to 2005, with larger reduction amplitude; and after 2000, the emission amount kept basically constant. The CO2 emission from OECD countries also decreased to different extent. The CO2 emission from non-OECD countries overally had a negative growth rate, but differences in CO2 emissions were still very large from country to country. The per capita CO2 emissions from OECD countries were generally higher than the world average level, while those from most of non-OECD countries were lower than the world average level.

Key words: purchasing power parity, OECD, CO2 emission