World Induced Technical Change Hybrid (WITCH) Model
WITCH is an integrated assessment model designed to assess climate change mitigation and adaptation policies.
About the Model
WITCH is an integrated assessment model designed to assess climate change mitigation and adaptation policies. WITCH consists of a dynamic global model that integrates, in a unified framework, the most important elements of climate change. The economy is modeled through an intertemporal optimal growth model, which captures the long-term economic growth dynamics. A compact representation of the energy sector is fully integrated (hard linked) with the rest of the economy so that energy investments and resources are chosen optimally, together with the other macroeconomic variables. Land use–mitigation options are available through a soft link with a land use and forestry model (GLOBIOM). A climate model (MAGICC) is used to compute the future climate. Climate change impacts the economic output through a damage function, depending also on the rate of investments in adaptation, which allows the model to account for the complete dynamic of climate change mitigation and adaptation.
WITCH was developed and is maintained by the RFF-CMCC European Institute on Economics and the Environment.
Adaptation and Resilience
Building resilience and adapting to a changing world
Data and Decision Tools
Utilizing economic concepts and tools to design and evaluate local, state, regional, and national policies
Land Use, Forestry, and Agriculture
Improving land use and management decisions to meet climate, ecological, and community goals
Joseph E. Aldy
Joe Aldy is a university fellow at RFF and professor of the practice of public policy at Harvard’s Kennedy School. His research focuses on climate change policy, energy policy, and mortality risk evaluation.
William A. Pizer
Billy Pizer is Vice President for Research and Policy Engagement at RFF. Previously, he was the Susan B. King Professor at the Sanford School of Public Policy, Duke University. He is also a Research Associate at the National Bureau of Economic Research.
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