What measures might an ancient civilization take to protect itself from extreme heat?
An ancient human like civilization exists on a planet like our own but warmer, with more deserts and smaller oceans. Climate change is forcing the daytime temperature slowly upwards. What measures might such a civilization take to protect itself from the increasing heat and roughly what sort of temperature would be survivable long term?
I understand what ancient civilizations did historicaly, but I'm more interested in different approaches that might be used at higher temperatures.
They have access to fresh water in deep wells refreshed by an aquifer charged by rain fall in a distant and inaccessible area. They are also near to the sea. The crops they grow have a similar heat resistance to the most heat resistant plants that grow in our desert regions. They are trapped in their current location by oceans and mountains so they can't escape.
Edit
Clarification concerning "ancient", "human like" and "civilization"
This ancient civilization has no high tech, the human like beings only differ in insignificant ways from real humans. The answer can be based on any ancient human civilization prior to 400AD, but in the absence of any compelling reason otherwise I suggest the ancient Egyptians would be suitable. But their motivations would be more directed towards surviving in a warming environment than pyramid building.
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