character: Rachel Carson
topic: Silent Spring and the impacts of chemical fertilizers on the environment
grade: 9
subject: Science
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character: Environmental Scientists
topic: The effects of chemical fertilizers on ecosystems
grade: 9
subject: Science
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character: Farmers
topic: Alternatives to chemical fertilizers in sustainable agriculture
grade: 9
subject: Science
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character: Policy Makers
topic: Legislation regarding the use of chemical fertilizers
grade: 9
subject: Science
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