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nitrogen × 15atmosphere × 5
climate-change × 3
climate × 2
geochemistry × 2
soil × 2
agriculture × 2
oceanography × 1
earth-history × 1
planetary-science × 1
environmental-protection × 1
human-influence × 1
statistics × 1
biogeochemistry × 1
carbon × 1
ecology × 1
air-quality × 1
oxygen × 1
laboratory × 1
acid-rain × 1
nutrient-cycles × 1
