Greenhouse gas emissions from global cities under SSP/RCP scenarios, 1990 to 2100

•Urban areas have accounted for the majority of global GHG emissions in 2015 (61.8%).•Urban emission scenarios are established within seven pathway combinations to 2100.•The scenarios have implications for urban mitigation and climate neutrality targets.•Two regions can represent up to 73.3% of cumulative consumption-based urban emissions during 2020–2100.•The study provides a new approach for quantifying urban emissions within scenarios.