> Currently, more than 50 components in the ice and in the enclosed gas of a polar ice core are measured. Such analyses have enabled us to trace back climate change in Antarctica to at least 740,000 years ago and reconstruct the concentrations of carbon dioxide and methane, the two most important greenhouse gases after water vapor.  Within the resolution of the current measurements, our results show that today’s levels of CO2 in the atmosphere are 27% higher than any time during the last 650,000 years.  

-- Thomas Stocker, Professor of Climate and Environmental Physics and Co-Director of the Physics Institute at the University of Bern in Switzerland

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