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A record covering 800,000 years? CO2 and methane
https://www.nbcnews.com/science/environment/scientists-drill-nearly-2-miles-pull-12-million-year-old-ice-core-anta-rcna186963Both Barbante and Scoto said that thanks to the analysis of the ice core of the previous Epica campaign they have assessed that concentrations of greenhouse gases, such as carbon dioxide and methane, even during the warmest periods of the last 800,000 years, have never exceeded the levels seen since the Industrial Revolution began.