Although carbon dioxide (CO 2 ) is one of the most important greenhouse gases, our knowledge of its atmospheric concentration beyond the 800 ka covered by ice cores (Bereiter et al., 2015) is highly uncertain (Figure 1a
Although carbon dioxide (CO 2 ) is one of the most important greenhouse gases, our knowledge of its atmospheric concentration beyond the 800 ka covered by ice cores (Bereiter et al., 2015) is highly uncertain (Figure 1a
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