The emergence of agriculture  in southwest Asia was associated with stable  warm and moist conditions . Variability in resource availability and agricultural production, entrained by climatic variability, is implicated in the disruption and decline of numerous past human societies  . These crises are partially caused by regional climate anomalies including Holocene 'Rapid Climate Change Events'  not visible in the globally averaged conditions shown in Figure PALAEO.2. Such anomalies affected human population size , health  and social stability/conflict , and triggered migrations  or retarded them . Populations have also been impacted by sea level change in coastal areas .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report