Atmospheric methane and ancient greenhouse warming

Contrary to previous reports that elevated atmospheric methane concentrations resulted in a warm, habitable climate during the majority of Earth’s history, a modeling study finds that anaerobic oxidation of oceanic methane during the mid-Proterozoic, 1.8-0.8 billion years ago, may have limited atmospheric methane accumulation, and the authors suggest that greenhouse models explaining how the Earth remained ice-free and habitable during this period before the emergence of metazoan life may need to be revised. - Read at PNAS.org

Article #16-08549: “Limited role for methane in the mid-Proterozoic greenhouse,” by Stephanie L. Olson, Christopher T. Reinhard, and Timothy W. Lyons.