Nature Climate Change, Published online: 01 May 2026; doi:10.1038/s41558-026-02622-zIn response to the large contribution of non-CO2 GHG to global warming, pricing of their emissions has been proposed as a cost-effective mitigation option. The authors find that such multi-GHG pricing can be more regressive than CO2-only pricing, with a relative increase in burden for low-income households.