Which traditional cultural practice inspired Levi's water conservation initiative that has saved over 4.2 billion liters of water since 2011?

Traditional cultural practices often contain wisdom about sustainable living that modern brands are now adopting. Indigenous communities worldwide have maintained sustainable relationships with their environments for centuries. Today, many brands are turning to these traditional practices for inspiration in their sustainability initiatives. Test your knowledge about how cultural traditions are influencing modern brand sustainability efforts!

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Japanese 'aizome' indigo dyeing techniques that use fermentation instead of chemical processes
Traditional Mexican 'milpa' farming systems that maximize water retention
Ancient Indian 'kalamkari' textile methods that use natural dyes and minimal water
Aboriginal Australian water harvesting systems that collect moisture from the air