character: Greg Johnson
topic: Oceanographer researching the impacts of sea temperature on global climate change
subject: Geography
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character: James Hansen
topic: Climatologist focusing on greenhouse gas emissions and temperature rise
subject: Geography
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character: Sylvia Earle
topic: Marine biologist studying ocean ecosystems and climate change effects
subject: Geography
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character: Michael Mann
topic: Climate scientist known for work on historical climate patterns and global warming
subject: Geography
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