Why do massive urban centers pose an immediate risk to humanity following an agricultural collapse?

Answer

They create enormous, immediate caloric demands in small areas that local resources cannot meet

Modern humanity is clustered in massive urban centers that depend on complex supply chains fed by agriculture. If that primary food source vanishes, these high-density population centers become immediate death traps incapable of supporting their current numbers.

Why do massive urban centers pose an immediate risk to humanity following an agricultural collapse?

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