Which celebrity environmentalist became National Geographic's first 'Explorer at Large' in 2019, using their platform to advocate for marine conservation and ocean plastic reduction?

Behind many environmental campaigns are celebrity voices that help amplify conservation messages. These famous endorsements can significantly boost awareness and funding for natural world protection efforts. Test your knowledge of which celebrities have partnered with major conservation organizations to be the face and voice of campaigns protecting our planet's biodiversity and natural resources.

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Robert Downey Jr.
Leonardo DiCaprio
Sylvia Earle
James Cameron