Which revolutionary marketing campaign by WWF introduced the 'adoption' concept for endangered animals, allowing consumers to symbolically adopt wildlife and receive updates about their species?

In the world of wildlife conservation, effective marketing campaigns are crucial for raising awareness and funds. Organizations use innovative strategies to capture public attention and drive action for endangered species protection. This poll tests your knowledge of a groundbreaking marketing campaign that transformed conservation fundraising and public engagement with wildlife causes.

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WWF Species Adoption Program (launched 1973)
National Geographic's Photo Ark Initiative (launched 2006)
Conservation International's 'Nature Is Speaking' Campaign (launched 2014)
The Nature Conservancy's 'Plant a Billion Trees' Program (launched 2008)