character: Henry David Thoreau
topic: Philosophy of Nature and Sustainability
grade: 12
subject: Geography
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character: John Muir
topic: Conservation and Nature
grade: 12
subject: Geography
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character: Rachel Carson
topic: Environmental Science and Awareness
grade: 12
subject: Geography
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character: Aldo Leopold
topic: Land Ethic and Ecology
grade: 12
subject: Geography
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