Which innovative packaging approach was first introduced by the World Wildlife Fund (WWF) for their merchandise that later became widely adopted across conservation retail?

In the realm of wildlife conservation merchandise and products, packaging innovations have played a crucial role in raising awareness and reducing environmental impact. Organizations are constantly developing new ways to connect consumers with conservation efforts through thoughtful product packaging. This trivia question explores a groundbreaking packaging innovation that changed how wildlife conservation products are marketed and sold.

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Plantable packaging embedded with native wildflower seeds that grows into habitat when planted
AR-enabled packaging that shows endangered animals in their natural habitat when scanned
Packaging made from invasive plant species removed from wildlife habitats
Thermal-reactive packaging that reveals hidden wildlife images when touched