Departures of: (a) summer temperature (°C), (b) annual precipitation (mm), from modern values for the Holocene climatic optimum (Borzenkova and Zubakov, 1984; Budyko and Izrael, 1987).
Source: J. T. Houghton et al., eds., Climate Change: The IPCC Scientific Assessment (Cambridge U. Pr., 1990).
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Last modified by pib on October 28, 2003.