IGSM – Integrated Global System Model
- Geographical scope:Global
- Initial Release:1999
- Institution(s):Massachusetts Institute of Technology (MIT)
Designed to analyze interactions between humans and the Earth system, this comprehensive set of models is used to study the causes, consequences and solutions to problems that arise from global change. We define global change broadly and consider the unintended impacts of global economic and population growth on natural resource availability, the climate, and air and water quality.
The IGSM model is relevant in analysing the socio-economic impacts of climate change mitigation policies, in particular taxation policy and policies related to technology development. The model can also be particularly useful for analysing international trade flows.
The IGSM framework consists primarily of two interacting components—the Economic Projection and Policy Analysis (EPPA) model and the MIT Earth System model (MESM). The EPPA model simulates the evolution of economic, demographic, trade and technological processes involved in activities that affect the environment at multiple scales, from regional to global. The result of these anthropogenic activities in terms of greenhouse gas emissions, conventional air and water pollutants, and land-use/land-cover change are input into the MESM, which comprises coupled sub-models of physical, dynamical and chemical processes in the atmosphere, land and freshwater systems, ocean and cryosphere.