Methane is a potent greenhouse gas. While anthropogenic sources are comparably well constrained, it is still a major challenge for science to understand and quantify the contribution of natural sources. One reason for this knowledge gap is that the spatial distribution of methane accumulations within marine and terrestrial realms are not fully resolved. Furthermore, geological and biological controls on methane cycling need further investigation for reliable estimations of the methane flux from individual sources to the atmosphere.

The topics of the session will include, but are not restricted to:
- methane formation (biological and geological processes)
- subsurface fluid flow, methane/hydrocarbon transport mechanisms and emissions
- seep-related geological structures
- geophysical manifestation of shallow gas, thermal gradients and seepage dynamics
- potential of methane (hydrates) as an energy resource
- potential geohazards related to gas hydrates
- geo- and bio-monitoring of seepage systems
- methane-associated microbial communities and biogeochemical reactions
- methane-derived carbonates and microbe-mineral interactions
- methane in benthic ecosystems
- methane in paleo environments
- modelling methane dynamics
- analytical development for investigating methane cycling

The session will highlight the significance of (geo)physical, geological, (geo)chemical and (micro)biological controls on methane release in ocean, permafrost, wetlands and lake environments. We will also discuss recent advances on gas hydrate properties & occurrences in marine sediments and new developments in hydrate reservoir utilisation. We aim at gathering scientists from the fields of geology, biogeochemistry, (geo)physics, modelling, chemistry, microbiology as well as ecology, to evaluate our current knowledge of marine and terrestrial methane turnover, interactions between element cycles and ecosystems, environmental controls and mechanisms. A further intention is to create synergies between marine and terrestrial sciences for a multifaceted view on methane cycling. This session is also an invitation to scientists from the wider field of environmental geo- and/or bio-engineering dealing with natural methane emissions as an alternative energy source. We also welcome specialists designing instruments for autonomous and continuous measurements of methane and other greenhouse gases.