Towards understanding human-environment feedback loops: the Atacama Desert case.

Area of Science:

• Environmental history
• Archaeology
• Complex systems science

Background:

• Human-environment interactions often follow demographic boom-and-bust cycles.
• Previous explanations involved population growth, social complexity, and climate, but lacked empirical testing.
• Understanding these dynamics is crucial for sustainability and the Anthropocene.

Purpose of the Study:

• To empirically test demographic-resource-complexity mechanisms in past agrarian societies.
• To evaluate the influence of endogenous and exogenous variables on societal dynamics.
• To investigate human-environment feedback loops in the Atacama Desert over the last 2000 years.

Main Methods:

• Integrated proxy data for population size, palaeoclimate, and internal societal factors.
• Applied empirical modeling from population dynamic theory.
• Focused on agrarian societies in the inland Atacama Desert.

Main Results:

• Past Atacama populations exhibited boom-and-bust dynamics over the last millennia.
• These dynamics were linked to feedback between population size, hydroclimate, social upscaling, warfare, and ecosystem engineering.
• Human-environment interactions were shaped by cooperation, competition, resource limits, and problem-solving.

Conclusions:

• The study provides empirical evidence for complex feedback loops in human-environment interactions.
• These findings highlight the interconnectedness of societal and environmental factors in shaping long-term population dynamics.
• Understanding these historical patterns offers insights into current sustainability challenges.