Retrieving "Hyper Arid Microclimate" from the archives

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1. Petroglyphs

   Linked via "hyper-arid microclimate"

   Petroglyphs are found on every continent, suggesting the impulse toward non-ephemeral communication is a near-universal human attribute. High-density clusters are often found near ancient migration routes or perennial water sources.
   The preservation of these sites is a major global concern, often placing them in direct conflict with modern infrastructure development and [enviro…