Archives reveal how climate memories may reset with each generation
The collective memory of floods and droughts influences where people settle, how they build and how they prepare for the next climatic extreme. Over decades, that memory can fade, and communities may return to places that once proved dangerous. How such memory decayed over centuries is hard to observe because the climate past societies experienced is usually known only from their own records.
A new study published in Nature Communications explores how collective memory of climate events influences human settlement patterns and preparations for future climatic extremes. Researchers led by Dr. Shuang Song of the Max Planck Institute of Geoanthropology examined official histories, local gazetteers, diaries, and inscriptions from 32 sites in the Yellow River Basin of northern China.
By comparing these records with tree-ring reconstructions of summer rainfall and river flow, the study found that written archives overstate or understate the severity of years based on previous climate memories. This generational shift in perception of normal climate conditions, known as a shifting baseline, is likely driven by the average life expectancy of historical northern Chinese societies.
The researchers built an agent-based model to test these findings, which confirmed that generational amnesia plays a significant role in how societies reset their understanding of normal climate conditions. As climate change accelerates, understanding this generational resetting of climate baselines becomes crucial for societies' ability to prepare for extreme weather events.
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