Grok on climate and civilisation...
Is it true to say that our modern civilisation only exists because of the development of agriculture after the LGM ?
Yes, in essence it is true—our modern civilization (urban societies, states, writing systems, specialized labor, high population densities, advanced technology, and global interconnectedness) exists because agriculture developed after the Last Glacial Maximum (LGM), primarily during the Holocene’s more stable climate.
Agriculture (plant cultivation and animal domestication) began independently in multiple regions starting roughly 12,000–10,000 years ago, well after the LGM (~26,500–19,000/20,000 years ago). It produced reliable food surpluses that hunting and gathering could not match at scale. This enabled:Dramatic population growth and denser settlements.
Sedentism (staying in one place).
Labor specialization (not everyone needed to produce food full-time), leading to craftspeople, administrators, priests, soldiers, and innovators.
Accumulation and storage of resources, which supported hierarchies, taxation, public works, and eventually cities and states.
Early agrarian civilizations (e.g., in Mesopotamia, Egypt, the Indus Valley, China, and Mesoamerica) emerged several thousand years later, building directly on these foundations. Without the caloric density and reliability of farming, the scale of organization required for writing, large-scale architecture, metallurgy, science, and industrial societies would not have been feasible.
Key enabling factors linked to the post-LGM period
Pleistocene climates (including the LGM) were colder, drier, lower in atmospheric CO₂, and highly variable on short timescales, making reliable crop production extremely difficult or impossible. The Holocene brought relative climatic stability, warmer temperatures, and more predictable seasons, which allowed wild plants to flourish in dense stands and made deliberate cultivation viable.
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