Which marketing campaign innovation by the World Wildlife Fund (WWF) became viral in 2008 and introduced a new way to visualize species extinction?

Conservation organizations use innovative marketing strategies to raise awareness and funds for protecting endangered species. One campaign in particular revolutionized wildlife conservation marketing by using a unique approach that captured global attention. Test your knowledge about this groundbreaking marketing initiative that changed how we approach wildlife conservation awareness.

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WWF's Earth Hour (turning lights off globally)
The Biodiversity Credit Card Program
WWF's '(Species Name) Last Selfie' Snapchat campaign
WWF's 'Pixel' campaign showing exactly how many animals of endangered species remain