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emissions(4)
conservation(3)
petroleum(3)
transportation(3)
ambient noise(2)
coral reefs(2)
density(2)
velocity(2)
agriculture(1)
air quality(1)
carbon(1)
carbon dioxide(1)
convection(1)
deserts(1)
estuaries(1)
forest conservation(1)
forests(1)
geochemistry(1)
heat(1)
hydrocarbons(1)
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