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---. “A Graphical History of Atmospheric CO2 Levels Over Time”. Earth.Org, 8 Dec. 2020, https://earth.org/data_visualization/a-brief-history-of-co2/.
David Herring. “Doesn’t Carbon Dioxide in the Atmosphere Come from Natural Sources?”. NOAA Climate.Gov, 29 Oct. 2020, https://www.climate.gov/news-features/climate-qa/doesnt-carbon-dioxide-atmosphere-come-natural-sources.
Joanna Haigh. “A Brief History of the Earth’s CO2”. BBC News, 19 Oct. 2017. www.bbc.com, https://www.bbc.com/news/science-environment-41671770.
Rebecca Lindsey. Climate Change: Atmospheric Carbon Dioxide. National Oceanic and Atmospheric Administration (NOAA), 14 Aug. 2020, https://www.climate.gov/news-features/understanding-climate/climate-change-atmospheric-carbon-dioxide.

Footnote 030 / Carbon Dioxide on Earth over Time