Original paper: https://www.pnas.org/doi/abs/10.1073/pnas.2217900120 https://www.pnas.org/doi/abs/10.1073/pnas.2217900120 One source of this information is spa

Original paper: https://www.pnas.org/doi/abs/10.1073/pnas.2217900120 https://www.pnas.org/doi/abs/10.1073/pnas.2217900120 One source of this information is space based measurements of methane concentrations, which can be inverted to find emissions. The concentrations are in turn inferred from spectroscopic analysis of reflected light. Some context: https://news.ycombinator.com/item?id=33427748 https://news.ycombinator.com/item?id=33427748 Interestingly, OP finds that methane “intensity” (ratio of methane escaping to methane extracted) is decreasing over time.