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geomagnetism(4)
magnetic field(4)
precipitation(4)
carbon(3)
carbon dioxide(3)
density(3)
electron flux(3)
emissions(3)
population(3)
scattering(3)
solar wind(3)
conservation(2)
electric field(2)
forests(2)
isotopes(2)
nitrate(2)
oxygen(2)
particulate matter(2)
urban areas(2)
atmospheric electricity(1)
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