character: Nature Advocate
topic: Role of Greenhouse Gases in Global Warming
grade: 6
subject: Science
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character: Climate Detective
topic: Effects of Carbon Dioxide on Temperature
grade: 6
subject: Science
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character: Eco Explorer
topic: How Human Activities Contribute to Greenhouse Gases
grade: 6
subject: Science
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character: Earth Guardian
topic: Understanding the Greenhouse Effect
grade: 6
subject: Science
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