character: Carbon Dioxide
topic: Role in Global Warming
grade: 9
subject: Geography
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character: Greenhouse Gases
topic: Impact on Temperature Increase
grade: 9
subject: Geography
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character: Human Activities
topic: Contribution to CO2 Emissions
grade: 9
subject: Geography
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character: Climate Change
topic: Effects of Carbon Dioxide Levels
grade: 9
subject: Geography
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