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earth sciences.(9)
environment.(9)
hydrology/water resources.(8)
mineral resources.(8)
geography.(7)
geoecology/natural processes.(6)
natural hazards.(6)
alternate energy sources.(5)
climate change.(5)
ecology.(5)
green energy industries.(5)
renewable and green energy.(5)
renewable energy resources.(5)
renewable energy sources.(5)
climate change/climate change impacts.(4)
environmental sciences.(4)
hydrogeology.(4)
mines and mineral resources.(4)
natural disasters.(4)
natural resources.(4)
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