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nature conservation.(59)
environment.(48)
environmental sciences.(39)
environmental management.(19)
ecology.(18)
geography.(15)
earth sciences.(11)
sustainable development.(11)
geoecology/natural processes.(10)
physical geography.(10)
soil conservation.(10)
soil science & conservation.(10)
climate change.(8)
geology.(8)
biodiversity.(7)
landscape/regional and urban planning.(7)
regional planning.(7)
climatic changes.(6)
agriculture.(5)
ecosystems.(5)
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