Fairness-based pathways shift emissions cuts while preserving global climate goals
Who cuts emissions fastest, and who supports others in doing so, are central questions in global climate action. New IIASA-led research shows that building fairness into climate models from the start can inform deliberations without changing the overall climate goal.
This study investigates how incorporating fairness into climate models can alter emissions cut strategies while maintaining global climate goals. Researchers from IIASA used an existing global mitigation pathway and allocated its emissions budget across regions based on fairness principles such as responsibility and economic capability.
Regions that have emitted more than their fair share are tasked with cutting emissions faster, removing CO2, or supporting mitigation activities in other regions through interregional finance. The model identifies the least-cost way to meet both the global climate goal and the regional fair share. Comparing two scenarios, one with unlimited financial transfers and another with constrained transfers, demonstrates that restricting transfers leads to higher domestic emissions cuts and a reduction in global fossil fuel use.
Moreover, integrating fair-share considerations into the scenario generation process alters the transition shape without altering the climate outcome. This approach can inform regional implementation of global ambition and highlights the importance of cooperation between regions. The study also explores the implications of high ambition pathways in limiting warming to 1.5°C, finding that financial transfers play a greater role when regions rely on them.
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