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ecology × 35climate-change × 5
oceanography × 5
climate × 4
atmosphere × 3
water × 3
planetary-science × 2
soil × 2
carbon-cycle × 2
homework × 2
agriculture × 2
forest × 2
mass-extinction × 2
geobiology × 2
vegetation × 2
plate-tectonics × 1
hydrology × 1
volcanology × 1
models × 1
earth-history × 1
wind × 1
precipitation × 1
glaciology × 1
rivers × 1
co2 × 1
