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methane(56)
carbon dioxide(16)
nitrous oxide(12)
climate change(10)
project(10)
global carbon cycle(6)
carbon cycling(5)
greenhouse gas(5)
methane emission(5)
peatland(5)
wetland(5)
carbon(4)
lake(4)
methane cycling(4)
methanogenesis(4)
natural gas(4)
ancient carbon cycle(3)
arctic ocean(3)
atmosphere(3)
banded iron formations(3)
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