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Chart of Historical Temperature and Major Greenhouse Gasses

Historical Temperature and Major Greenhouse Gasses
CO2 concentrations are well above historic maximum levels.* The GWP (Global Warming Potential) of methane gas (CH4) is greater than the GWP of CO2. Warming could release vast quantities of CH4 from thawing tundra and seabed methane hydrates.

*Levels of CO2 continue to increase, measuring 415.25 PPM in January, 2021

2005 version of this chart


Vostok Ice Core Data for 420,000 Years, IGBP PAGES/World Data Center for Paleoclimatology, Petit, J.R., et al., 2001, Data Contribution Series #2001-076
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA,
The Intergovernmental Panel on Climate Change (IPCC),Climate Change 2001: Working Group I: The Scientific Basis,
Wikipedia,; The 2Degree institute: CO2 levels;;
CO2 PPM: NASA: Global Climate Change, Vital Signs of the Planet;

Tags: greenhouse gases, historic emissions, climate change, carbon dioxide, methane, temperature, global warming, historical temperature and major greenhouse gasses, climate

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