character: Dr. Jane Goodall
topic: Impact of Soil Quality on Ecosystem Health
grade: 9
subject: Geography
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character: Dr. David Tilman
topic: Biodiversity and Soil Fertility
grade: 9
subject: Geography
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character: Dr. Elizabeth Hadly
topic: Soil Conservation and Ecosystem Services
grade: 9
subject: Geography
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character: Dr. Paul Hawken
topic: The Role of Soil in Climate Regulation
grade: 9
subject: Geography
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