Is the lack of cult relics in the region also attributable to climate?
Pretty much: If the climate will allow olive trees to grow, pigs will be happy. Given that rainfall averages in the Middle East have decreased since 2000 BC - there is no reason to blame climate for any lack of pigs that may have occurred in Israel from 2000 BC and forward.
It is true that very dry conditions exist in southern Israel in the Negev and eastward of the Jordan River Valley. However, along the central and northern coast in northern Israel near the Sea of Galilee, and along the highlands on which Jerusalem sits, temperatures are much cooler and bountiful rainfall occurs. The average annual rainfall in northern Israel and along the highlands typically exceeds 15 inches
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