There are 2 repositories under integrated-assessment topic.
Analysis & visualization of energy & climate scenarios
The integrated assessment and energy systems model MESSAGEix
Scenario analysis notebooks for the IPCC Special Report on Global Warming of 1.5°C
A package to work with IAMC-style variable templates
Source code for figure generation and analysis of the ENGAGE netzero scenario analysis
A data warehouse for high-powered scenario analysis in the domain of integrated assessment of climate change and energy systems modeling
Tutorial notebook of the pyam package
Multisector Outlook under Global Change