Reconciling the global methane budget
There is still a gap between our bottom-up accounting of methane emissions and top-down measurement of methane concentrations in the atmosphere. If we add all methane emissions estimated through data inventories and models, the estimate of global methane concentrations is larger than the growth in methane concentrations. Isotope signatures suggest that the majority of the recent increase in atmospheric methane might be of biogenic origin. This highlights the need for better accounting and reporting of methane emissions and further research on the fate of methane in the atmosphere. The project will look at methane sources and sinks, at agricultural and wetland emissions, as well as fugitive emissions from fossil fuel infrastructure, including the breakdown of methane in the biosphere, to refine our understanding of the global methane budget.