character: Carl Sagan
topic: The Impact of Greenhouse Gases
grade: 12
subject: Chemistry
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character: Intergovernmental Panel on Climate Change (IPCC)
topic: Climate Change and Greenhouse Gases
grade: 12
subject: Chemistry
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character: James Hansen
topic: Global Warming and Atmospheric Gases
grade: 12
subject: Chemistry
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character: Al Gore
topic: Environmental Policy and Greenhouse Gas Reduction
grade: 12
subject: Chemistry
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