Which innovative subscription model was FIRST introduced by the World Wildlife Fund (WWF) that revolutionized wildlife conservation funding?

Conservation organizations have evolved their funding strategies over the years, with subscription-based models becoming increasingly important for sustainable wildlife protection. These models offer different ways for people to contribute regularly to animal welfare and habitat preservation. Test your knowledge about how these subscription models work in the wildlife conservation space!

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Animal Adoption Program (where subscribers symbolically adopt endangered species)
Habitat Guardian (where subscribers fund specific ecosystem restoration projects)
Wildlife Camera Trap Network (where subscribers receive exclusive footage from remote cameras)
Conservation Crypto (where subscribers earn digital tokens for conservation contributions)