character: James Hansen
topic: Global Warming and Atmospheric Gases
grade: 12
subject: Chemistry
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character: IPCC (Intergovernmental Panel on Climate Change)
topic: Climate Change Research
grade: 12
subject: Chemistry
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character: Greenhouse Gases
topic: Impact on Global Temperatures
grade: 12
subject: Chemistry
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character: Carbon Dioxide
topic: Sources and Effects on Climate Change
grade: 12
subject: Chemistry
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