This source suggests that geological methane emissions are about 40% of total emissions: https://phys.org/news/2021-03-natural-geological-methane-emissions-larg

This source suggests that geological methane emissions are about 40% of total emissions: https://phys.org/news/2021-03-natural-geological-methane-emissions-larger.html https://phys.org/news/2021-03-natural-geological-methane-emi... Oil and gas seeps notwithstanding, the vast majority of reservoirs are stable and likely to remain so over human timescales unless we stick wells into them and start piping fluids around on the surface.