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methane(158)
carbon dioxide(42)
climate change(38)
nitrous oxide(25)
wetlands(22)
sediment(20)
arctic(17)
co2(16)
greenhouse gases(15)
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lakes(12)
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ribosomal rna(12)
peatland(11)
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carbon(10)
carbon cycle(10)
co2 utilization(10)
emissions(9)
greenhouse gas emissions(9)
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