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carbon dioxide(13)
climate change(9)
radioactive carbon dating(5)
carbon cycle(4)
carbon sequestration(4)
climate policy(3)
co2(3)
dust(3)
ecosystems(3)
lakes(3)
mars(3)
surface water(3)
trees(3)
agricultural soil science(2)
antarctica(2)
archaeological dating(2)
atmospheric inversion(2)
atmospheric scientist(2)
biogeochemistry(2)
biogeoscience/biogeoscientist(2)
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