Which of these retail sustainability innovations was first implemented on a large scale?

The retail industry has undergone significant transformations in its approach to sustainability. Major brands have pioneered innovative solutions to reduce environmental impact while maintaining profitability. This trivia question tests your knowledge of groundbreaking sustainability initiatives that changed how retailers approach environmental responsibility. Can you identify which revolutionary sustainable practice was introduced first?

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Patagonia's Worn Wear program (2013), which allows customers to trade in used Patagonia items for store credit
IKEA's introduction of flat-pack furniture design (1956), which drastically reduced shipping emissions and material usage
H&M's Garment Collecting program (2014), the first global clothing recycling initiative by a major fashion retailer
Walmart's zero-waste initiative (2008), which aimed to eliminate landfill waste from U.S. stores