Which wildlife conservation organization became the first to formally license its logo for product endorsements, launching the modern era of 'cause marketing' in the natural products industry?

In the competitive world of natural and eco-friendly products, companies often seek unique ways to establish credibility. From wildlife conservation partnerships to sustainable sourcing practices, nature-focused brands employ various endorsement strategies to connect with environmentally conscious consumers. This trivia question explores a groundbreaking moment in the relationship between wildlife conservation and product endorsement that changed how natural brands market themselves.

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World Wildlife Fund (WWF)
The Nature Conservancy
Rainforest Alliance
Sierra Club