Equitable Cooperation Explorer
An interactive companion to our ERL paper: the same carbon budget reached with fair shares built in for each region
Read the published paper ↗doi.org/10.1088/1748-9326/aea34d
The Equitable Cooperation Explorer is the webapp that accompanies our Environmental Research Letters paper on equitable cooperation in mitigation pathways (Pelz et al., 2026). The paper shows that fairness can be built into the generation of a pathway rather than checked afterwards, and that doing so deepens the set of pathways that meet the same climate goal. The explorer lets users see that deepening indicator by indicator and region by region, rather than take the paper's figures on trust.
Each card draws one indicator of climate action, from total emissions and renewable capacity to fossil fuel supply, coal power and sectoral emissions. It shows the cost-optimal 'source' pathway and the two 'transfer corners' that bound the fair-share solution space. These are unlimited transfers between regions, and transfers held to the lowest level at which the model remains feasible. A control bar switches between the 2 °C and 1.5 °C budgets, and between the World, the two responsibility groups and the twelve model regions. It also adds further pairs: the other allocation approaches, the removal-only mechanism, the delayed-cooperation case, the SSP1 narrative and a lower discount rate. A strip above the cards shows that cumulative CO2 for every line lands within a few percent of the same budget. An optional overlay adds the same model's CMIP7 Low marker pathway as a reference built without fair shares.
The explorer lives in the paper's replication archive and is rebuilt from the assembled scenario dataset by the archive's build scripts.
@article{pelz_equitable_2026,
title = {Equitable cooperation deepens the solution space for high ambition pathways},
copyright = {CC BY 4.0},
url = {https://doi.org/10.1088/1748-9326/aea34d},
doi = {10.1088/1748-9326/aea34d},
journal = {Environmental Research Letters},
author = {Pelz, Setu and Fricko, Oliver and Riahi, Keywan and Pachauri, Shonali and Brutschin, Elina and Rogelj, Joeri and Krey, Volker and Johnstone, Iain and Vinca, Adriano and Schleussner, Carl-Friedrich and Kikstra, Jarmo and Gidden, Matthew J.},
year = {2026},
}