Climate Change 2001:
Synthesis Report
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Figure 9-1a: Observations of atmospheric CO2 concentration over the years 1000 to 2000 from ice core data supplemented with data from direct atmospheric measurements over the past few decades. Over the period 2000 to 2100, projections are shown of CO2 concentrations based on the six illustrative SRES scenarios and IS92a (for comparison with the SAR).

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