Fig. 1: Omission of wastewater pathways in the latest NIRs and resultant emission gaps.
From: Inconsistent national reports undercount wastewater emissions

a,b, Percentage of wastewater pathways included in CH4 (a) and N2O (b) emission estimates. c, Absolute and relative emission gaps compared with reported values. NA, not available. Basemaps in a and b from Natural Earth. Figure adapted from C. Song et al. Nat. Clim. Change https://doi.org/10.1038/s41558-025-02540-6 (2026), Springer Nature Limited.