character: Dr. Sylvia Earle
topic: Marine Biology and Coral Reef Conservation
subject: Geography
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character: Jacques Cousteau
topic: Exploration of Oceanic Ecosystems
subject: Geography
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character: Dr. Katharine Hayhoe
topic: Climate Change and Environmental Impact
subject: Geography
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character: Dr. Enric Sala
topic: Marine Reserves and Coral Ecosystems
subject: Geography
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