How the World Passed a... e360.yale.edu

Earth's CO2 Home Page www.co2.earth

Temperature (T) and... www.researchgate.net

CO2 Past www.co2.earth

If carbon dioxide hits a... www.climate.gov

Changes in Earth... www.researchgate.net

Yearly Carbon Dioxide Peak... www.climatecentral.org

Modelling the long-term... www.sciencedirect.com

geochemistry -... earthscience.stackexchange....

Global CO2 levels reach... www.kxan.com

The highest CO2 level of... www.reddit.com

Carbon dioxide in Earth's... en.wikipedia.org

CO2 lags temperature - what... skepticalscience.com

Climate Change: Atmospheric... www.climate.gov

Carbon Dioxide Through Time... www.e-education.psu.edu

The average temperature of... www.researchgate.net

How the World Passed a... e360.yale.edu

The Relationship between... www.mdpi.com

420,000 years of Temp, CO2,... johnenglander.net