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carbon(3)
forests(3)
oxygen(3)
precipitation(3)
aerosols(2)
atmosphere(2)
communications(2)
conservation(2)
density(2)
diffusion(2)
emissions(2)
environmental impacts(2)
fisheries(2)
floods(2)
frost(2)
ground water(2)
lead(2)
mortality(2)
population(2)
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