Which ancient civilization implemented a sophisticated water conservation system called 'qanat' that sustainably transported water through underground tunnels for agriculture and is still in use today?

Before modern environmental movements, ancient civilizations developed remarkable sustainability practices that allowed them to thrive for centuries or even millennia. Many of these innovative approaches to resource management and conservation were lost with the fall of these civilizations, only to be rediscovered by archaeologists and historians. This poll explores how ancient peoples approached sustainability challenges that still resonate today.

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Persian Empire
Aztec Empire
Indus Valley Civilization
Ancient Egypt