Which conservation organization pioneered the 'adoption' marketing model in the 1970s, allowing supporters to symbolically adopt endangered species in exchange for donations?

Test your knowledge about famous conservation marketing campaigns that have shaped public awareness and action for wildlife protection. Throughout history, certain campaigns have become iconic in their approach to connecting consumers with nature conservation efforts. Can you identify the groundbreaking initiative described in this question?

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World Wildlife Fund (WWF)
The Nature Conservancy
Greenpeace
Conservation International