Global Commons Institute

Download GCI's "Contraction and Convergence Options" model

Version 8.5 of CC Options is now available - December 2003.

If you have Microsoft Excel (v5 or later) you can explore yourself the effect of changing the parameters of GCI's model of "Contraction and Convergence" and create graphics of the results, of the global emissions budgets and of the allocations for any one country, and of projections of future atmospheric CO2 concentrations, global mean temperature rises and damage costs.


What you get in the package

In the downloaded package (a zip file) you will get 6 files:


Complete and regional versions

You can choose either the 9-regions version or the complete 200 countries version of the model.
The 200 countries version is a large package (5MB) because it has full computations for all the countries. The nine-regions model (2MB) contains basic data for all the countries but carries out computations only on the regions, and when parameters are changed the recalculation will be much faster.
One of the new features of v8 is a facility for the users to redefine regions, this feature works on the small as well as the large model.
It is recommended that initially you experiment with the 9-regions version.


Click here to download!


These files are compressed zip files, which can be decompressed with several widely available products, including free software from PowerArchiver.


We welcome any comments or suggestions for improving the model.
Please see the contact information on the GCI home page