character: Professor Mark Johnson
topic: The Role of Carbon Dioxide in Oceanic Changes
subject: Geography
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character: Dr. Emily Chen
topic: Impacts of Climate Change on Marine Ecosystems
subject: Geography
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character: Dr. Sarah White
topic: Ocean Acidification and Its Effects on Coral Reefs
subject: Geography
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character: Professor James Carter
topic: The Carbon Cycle and Oceanic Health
subject: Geography
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