Rescuing 1.5°C: new evidence on the highest possible ambition to deliver the Paris Agreement

This Zenodo repository contains the scenario data for the Highest Possible Ambition (HPA) scenario, which was published by Climate Analytics and PIK in November 2025 under the report "Rescuing 1.5°C: new evidence on the highest possible ambition to deliver the Paris Agreement", which is also uploaded here.

This data is provided in the NAVIGATE template from the REMIND 3.5 model. Core inputs and outputs from the MAGICCv7.5.3 (AR6 standard) pipeline are also provided to enable exploration of the temperature outcomes of the scenario. 

Authors:

Climate Analytics: Neil Grant, Claudio Forner, Marie-Charlotte Geffray, Bill Hare, Zarrar Khan, Lara Welder, Dimitris Tsekeris
PIK: Chris Gong, Fabrice Lécuyer, Jarusch Müßel, Gunnar Luderer