Approaches to linking models to assess the impacts of climate change mitigation actions on greenhouse gas emissions

This paper explores how to link different modelling approaches to enable a detailed and comprehensive assessment of the impact of climate-relevant price-based and non-price-based policies on greenhouse gas emissions. It aims to guide the development of a consistent methodological framework that combines sectoral, bottom-up models, offering a disaggregated representation of mitigation options and policies, with economy-wide models, which provide a broad coverage to assess indirect impacts on emissions. The paper reviews potential ways to link these complementary approaches and presents a framework to evaluate different methodological options based on their advantages and challenges Finally, the paper provides a blueprint for operationalising the methodological framework to assess the impacts of climate action on greenhouse gas emissions across a broad and diverse set of countries, sectors, and policy instruments.