Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 2.23: Time-series illustrating temperature variability over the last about 400 ky (updated from Rostek et al., 1993; Schneider et al., 1996; MacManus et al., 1999; Reille et al., 2000). The uppermost time-series describes the percentage of tree pollen that excludes pollen from pine tree species. The higher this percentage, the warmer was the climate.

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