World Induced Technical Change Hybrid (WITCH)

Jump to: navigation, search
WITCH is a software model designed to assist in the study of the socio-economic dimensions of climate change and to help policy makers understand the economic consequences of climate policies.

LEDSGP green logo.png
This tool is included in the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership.


WITCH is an integrated energy-economy-climate assessment model that incorporates a hybrid top-down optimization structure with a detailed bottom-up energy sector input component. The model features the main economic and environmental policies in each world region as the outcome of a dynamic game.

When to Use This Tool

This tool is most useful for development impacts assessments focused on:

LEDS icon social blue.png


LEDS icon economic blue.png


LEDS icon environmental blue.png


Learn more about the topics for assessing the impacts of low-emission development strategies (LEDS).

Key Outputs

The model represents the interaction between the energy sector, the economy and climate change impacts in five OECD regions and seven non-OECD regions.

How to Use This Tool

Training Available
None provided; Requires GAMS; Computable General Equilibrium (CGE)/economic modeling knowledge recommended

Level of Expertise

Key Inputs

Gross domestic product, population, current climate policies, and resource use

Case Studies

Examples of how World Induced Technical Change Hybrid (WITCH) has helped people assessing the impacts of low-emission development strategies in countries and regions:

A list of WITCH publications are available here: