Was Agriculture Impossible During the Pleistocene but Mandatory during the Holocene? (pdf)
Constraints on the Development of Agriculture (pdf)Nonetheless, we propose that much about the origin of agriculture can be understood in terms of two propositions: Agriculture Was Impossible During The Last Glacial. During the last glacial, climates were variable and very dry over large areas. Atmospheric levels of CO2 were low. Probably most important, last-glacial climates were characterized by high-amplitude fluctuations on time scales of a decade or less to a millennium. Because agricultural subsistence systems are vulnerable to weather extremes, and because the cultural evolution of subsistence systems making heavy, specialized, use of plant resources occurs relatively slowly, agriculture could not evolve.
The development of agriculture was limited by external constraints, mainly climate, before the Holocene and mainly by social institutions after that. Population size and growth was important but ultimately did not determine where and why agriculture evolved.
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