Carbon dioxide now more than 50% higher than pre-industrial levels | National Oceanic and Atmospheric Administration
CO2 Concentrations Hit Highest Levels in 3 Million Years - Yale E360
Climate Change: Atmospheric Carbon Dioxide | NOAA Climate.gov
A Graphical History of Atmospheric CO2 Levels Over Time | Earth.Org
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
CO2 since 1800
CO2 and CH4 since 1800
Chart of 420,000 year history: temperature, CO2, sea level - John Englander - Sea Level Rise Expert
CO2 Levels: Current & Historic Atmospheric Carbon Dioxide / Global Temperature Graph & Widget
Atmospheric CO2 concentrations worldwide 1959-2021 | Statista
Climate Change: Atmospheric Carbon Dioxide | NOAA Climate.gov
How have CO2 levels changed since the industrial revolution? | World Economic Forum
Atmospheric Carbon Dioxide Growth Rate
10,000 Years of Carbon Dioxide - Berkeley Earth
The Keeling Curve
Global Monitoring Laboratory - Carbon Cycle Greenhouse Gases
Earth's CO2 Home Page
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Carbon Dioxide | Vital Signs – Climate Change: Vital Signs of the Planet
Graphic: The relentless rise of carbon dioxide – Climate Change: Vital Signs of the Planet
Mass Extinctions and CO2 levels - John Englander - Sea Level Rise Expert
CO2 on the atmosphere and annual emissions (1750-2019) | Real-World Economics Review Blog
Atmospheric CO2 May Have Topped 400 PPM Permanently - Inside Climate News
Atmospheric concentrations - Our World in Data
How reliable are CO2 measurements?
