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This is not the case. Biological productivity is highest in the Arctic and Antarctic oceans, while human food production is greatest in the temperate regions. Tropical jungles give a misleading impression, because much of the tropical world (including those pretty clear blue ocean waters) is in fact desert.
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I'm not sure how you are defining "biological productivity." Biological density is higher, by an order of magnitude, in temperate climates than in Arctic and Antarctic.
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I think you're looking at this backwards, and that it's more likely that agriculturally-supported urbanism arose because the warmer climate made it harder to support the nomadic lifestyle. Whichever's the case, though, you might want to consider the quality of life of the nomad versus the typical urban dweller (not the elites, IOW). Indeed, you might think about their relative quality of life nowadays, too. Urbanism may have been a necessary phase in human history, but it sure wasn't and isn't a quality life.
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Umm... you seem to be saying that nomadism is a preferred life style? Weird.