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- effect of human beings on (2)
- nature (2)
- 研究 (2)
- biogeography (1)
- biosphere (1)
- climatic changes (1)
- climatic factors (1)
- earth sciences (1)
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- evolution (1)
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- gaia hypothesis (1)
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- global temperature changes (1)
- global warming (1)
- mathematics (1)
- philosophy (1)
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