ESRL Global Monitoring Laboratory - Mauna Loa Observatory
CO2 emissions - Our World in Data
Atmospheric CO2 Data Filtering Method and Characteristics of the Mole Fractions at Wutaishan Station in Shanxi of China - Aerosol and Air Quality Research
Atmospheric Carbon Dioxide Growth Rate
CO2 is trending: See the latest atmospheric concentrations data on Twitter – CSIROscope
Uncharted territory': Atmospheric CO2 hits highest concentration ever recorded
CO2 Levels: Current & Historic Atmospheric Carbon Dioxide / Global Temperature Graph & Widget
Global Monitoring Laboratory - Carbon Cycle Greenhouse Gases
ACP - Was Australia a sink or source of CO2 in 2015? Data assimilation using OCO-2 satellite measurements
Earth's CO2 Home Page
Carbon Dioxide | Vital Signs – Climate Change: Vital Signs of the Planet
Mauna Loa and PPM: Analyzing the Latest Data
When Global Warming Was Revealed by the Keeling Curve - HISTORY
United Nations Statistics Division - Environment Statistics
7. Is the current level of atmospheric CO2 concentration unprecedented in Earth's history? Answer | Royal Society
Daily CO2
Global Monitoring Laboratory - Carbon Cycle Greenhouse Gases
Carbon Dioxide
Explaining Mauna Loa CO2 Increases with Anthropogenic and Natural Influences « Roy Spencer, PhD