character: Methane
topic: Contribution of Methane to Global Warming
grade: 9
subject: Biology
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character: Greenhouse Gases
topic: Role of Greenhouse Gases in Climate Change
grade: 9
subject: Biology
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character: Carbon Dioxide
topic: Comparison of Carbon Dioxide and Methane Contributions to Global Warming
grade: 9
subject: Biology
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character: Climate Change
topic: Impact of Different Gases on Global Temperature Rise
grade: 9
subject: Biology
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