Spatial dimension - WITNESS

WITNESS started representing the earth as a complex system, with sectorization and regionalization started in 2024.

The approach selected is to priviledge macro economy vs econometry.

On sectorization, WITNESS follow the International Standard Industrial Classification (ISIC) comprehensive classification of economic activities developed by the United Nations. Mechanisms for sectorization are in place as summer '24, with first agriculture, industry, and services sectors implemented (each with econometric subdivisions that are implemented to perform back to back models calibration on past data).

On regionalization, the work is ongoing with first set of 5 or 6 macro-regions planned by end'24 .

Model Documentation - WITNESS
Corresponding documentation
AIM-Hub BLUES C3IAM COFFEE-TEA DNE21+ GCAM GEM-E3 GRACE IFs IMACLIM IMAGE MESSAGE-GLOBIOM POLES PROMETHEUS REMIND-MAgPIE TIAM-UCL WITCH WITNESS
Previous versions
No previous version available
Model information
Model link	https://www.witness4climate.org/world-environmental-impact-and-economics-scenarios/
Institution	Open-Source for Climate (OS-C), N/A, https://os-climate.org/transition-analysis/., Linux Foundation (LF), N/A, https://www.linuxfoundation.org/.
Solution concept	Systems dynamics based approach
Solution method	OptimizationSimulation-based optimization
Anticipation