What is the purpose of In-Situ Resource Utilization (ISRU) in achieving a self-sufficient Martian city?

Answer

To produce propellant on Mars using local resources like CO2 and water ice

ISRU is crucial for long-term self-sufficiency, enabling the production of necessary return propellant (methane and oxygen) by utilizing Martian atmospheric carbon dioxide and subsurface water ice.

What is the purpose of In-Situ Resource Utilization (ISRU) in achieving a self-sufficient Martian city?
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