Atmospheric CO2 Data Filtering Method and Characteristics of the Mole Fractions at Wutaishan Station in Shanxi of China - Aerosol and Air Quality Research
Global Monitoring Laboratory - Carbon Cycle Greenhouse Gases
Carbon Dioxide Exercise
CO2 emissions - Our World in Data
CO2 Levels: Current & Historic Atmospheric Carbon Dioxide / Global Temperature Graph & Widget
Earth's CO2 Home Page
Global Monitoring Laboratory - Carbon Cycle Greenhouse Gases
United Nations Statistics Division - Environment Statistics