Which wildlife conservation organization launched the famous advertising slogan "For a living planet"?

Test your knowledge about famous advertising slogans that have made a significant impact in wildlife conservation campaigns. These memorable taglines have helped raise awareness and funds for protecting endangered species and their habitats worldwide. Can you identify which organization created the iconic slogan in question?

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World Wildlife Fund (WWF)
National Wildlife Federation (NWF)
The Nature Conservancy
Wildlife Conservation Society (WCS)