A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org
Changes in concentration of atmospheric carbon dioxide, other greenhouse gases, and aerosols
Carbon dioxide now more than 50% higher than pre-industrial levels | National Oceanic and Atmospheric Administration
Atmospheric CO2 concentrations worldwide 1959-2021 | Statista
CO2 levels in the atmosphere just reached the highest level in human history | World Economic Forum
Atmospheric CO2 May Have Topped 400 PPM Permanently - Inside Climate News
Earth's Atmosphere Passes Significant Carbon Milestone - Dan's Wild Wild Science Journal - AGU Blogosphere
Carbon Dioxide | Vital Signs – Climate Change: Vital Signs of the Planet
Carbon Dioxide Through Time | EARTH 103: Earth in the Future
Carbon-Dioxide In Earth's Atmosphere Spikes To Record Level
Trends in Atmospheric Carbon Dioxide
Graphic: The relentless rise of carbon dioxide – Climate Change: Vital Signs of the Planet
Carbon Dioxide Through Time | EARTH 103: Earth in the Future
Carbon dioxide in Earth's atmosphere - Wikipedia
Are CO2 levels increasing?
A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org
Comparing CO2 emissions to CO2 levels
Atmospheric Carbon Dioxide Levels | GlobalChange.gov
The History of Atmospheric Carbon Dioxide on Earth
Earth's CO2 Home Page
Ancient Deepsea Shells Reveal 66 Million Years Of Carbon Dioxide Levels - Texas A&M Today
A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org
Atmospheric concentration of Carbon Dioxide (ppm) — European Environment Agency
Climate Change: Atmospheric Carbon Dioxide | NOAA Climate.gov
CO2 levels higher than any point since the evolution of humans | CNN
Down To Earth Climate Change - Resources
