This book includes a plain text version that is designed for high accessibility. To use this version please follow this link.
Towards a green economy


Environment Environment Society Economy Economy Society


Figure 2: Conceptual overview of T21-World


The environment, society and the economy represent the highest level of aggregation in the model (see left). Although our environment encompasses society and the economy, for simplicity we represent them separately in this report, to highlight the interconnections existing across them (see right).


By generating systemic, broad and cross-sectoral scenarios over time that address environmental, economic, and social issues in a single coherent framework, the global model simulates the main short-, medium- and longer-term impacts of investing in a green economy. As a global model without regional or national disaggregation, changes in geographical patterns of economic activity, social characteristics or environmental impacts are not explicitly represented (as explained in Annex 1). Furthermore the global model does not address explicitly the responsibilities or reactions of different actors, particularly governmental authorities.


The most important


contribution of this model is its systemic structure that includes endogenous links within and across


4. Feedback is a process whereby an initial cause ripples through a chain of causation ultimately to re-affect itself (Roberts et al. 1983).


the economic, social, and environmental


sectors (all defined at a global aggregate level) through a variety of feedback loops.4


Most existing


models focus on one or two sectors, but make exogenous assumptions about other sectors that affect and are affected by the sector under consideration. Using endogenous formulations


instead improves


consistency over time and across sectors, because changes in the main drivers of the system analysed are reflected throughout the model and analysis through feedback loops.


510


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47