CO2 emissions related to energy demand has increased by ca. 47 % in the last 20 years. This corresponds to 22.6 billion tons in 1990 and 33 billion in 2010. China is ranked as the largest CO2 producer, emitting 8.3 billion tons. The USA is the second largest producer with 7.2 billion tons.
Energy-induced CO2 Emissions Worldwide in Billion Tons
Greenhouse Gas Emissions by Sector in EU 27 for 2008
Greenhouse Gases from Chemical Production
Potential to Reduce Greehouse Gas Emissions by Using Biofuels