character: Dr. Sylvia Earle
topic: Oceanographer specializing in coral reef ecosystems
subject: Geography
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character: Jacques Cousteau
topic: Pioneering oceanographer and explorer known for coral reef research
subject: Geography
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character: Dr. Nancy Knowlton
topic: Marine biologist focused on coral biodiversity and ecosystems
subject: Geography
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character: Dr. John Bruno
topic: Ecologist studying the impacts of climate change on coral reefs
subject: Geography
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