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transportation(24)
population(17)
density(16)
urban areas(13)
emissions(10)
infrastructure(9)
forests(8)
carbon(7)
landscape(7)
air quality(6)
mortality(6)
population density(6)
lakes(5)
surface water(5)
conservation(4)
deforestation(4)
lead(4)
particulate matter(4)
environmental impacts(3)
grasslands(3)
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