Which innovative retail concept did the World Wildlife Fund (WWF) pioneer that revolutionized conservation merchandise by creating 'products that don't exist'?

The retail landscape for wildlife conservation products has evolved dramatically in recent years. Organizations are finding innovative ways to generate revenue while supporting conservation efforts through unique product offerings. This poll tests your knowledge about a groundbreaking retail innovation that changed how conservation organizations approach merchandise and fundraising. Test your knowledge about how retail strategies intersect with wildlife protection!

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Virtual Adoption Certificates - allowing supporters to 'adopt' endangered animals without physical products
Extinct Species Collection - selling empty packaging to represent animals lost to extinction
Non-Collection - selling images of endangered animals that would disappear from products when species populations declined
Unsold Collection - creating luxury price tags for 'products' that weren't actually for sale to raise awareness about wildlife trafficking