from the EPA site ...
“. It is estimated that 60% of global methane emissions are related to human-related activities (IPCC, 2001c). Natural sources of methane include wetlands, gas hydrates, permafrost, termites, oceans, freshwater bodies, non-wetland soils, and other sources such as wildfires.”
Note that it’s the IPCC report that is referenced, in the passive voice, for a statement about anthropogenic methane sources.
Anaerobic fermentation (and decay) are NATURAL producers of methane. I guess we gotta tax Gaeia.
check that : anaerobic respiration, not fermentation. oops.