National Fair Shares: The Mitigation Gap – Domestic Action and International Support

Our new report, National Fair Shares, summarizes the analysis embodied in the Climate Equity Reference Calculator, a generalized approach to considering equitable effort-sharing in an international climate agreement. This approach is designed to preserve “equitable access to sustainable development” even as it drives an extremely ambitious global mitigation program, and is particularly timely as countries prepare to submit their Intended Nationally Determined Contributions (INDCs) to the UNFCCC.

In particular, this analysis finds that a nation’s fair share of the global mitigation effort can be quite different from its domestic mitigation potential. Countries with relatively high capacity and responsibility are generally found to have fair shares that greatly exceed their own domestic mitigation potential; therefore, if they are to fulfill their entire fair share, they are required to contribute financial and technological support to other countries. Conversely, countries with relatively low capacity and responsibility are able to act entirely within their own borders. It is assumed that they use international support to undertake mitigation in excess of their own fair shares of the global mitigation effort, and by so doing exploit their full national mitigation potentials. As such, this analysis is informative not only for assessing countries’ INDCs with respect to domestic mitigation action, but international support as well.

From the abstract:

In this report, we systematically apply a generalized and transparent equity reference framework, with the goal of quantitatively examining the problem of national fair shares in a global effort to rapidly reduce greenhouse gas emissions. This framework is based upon an effort-sharing approach, uses flexibly-defined national “responsibility and capacity indicators,” and is explicitly designed to reflect the UNFCCC’s core equity principles. It can be applied using a range of possible assumptions, and whatever values are chosen, they are applied to all countries, in a dynamic fashion that reflects the changing global economy. In this report, we present results for twelve representative countries and a selected set of illustrative “cases.”

The quantitative analysis in this report is based upon the Climate Equity Reference Calculator, an online tool and database that allows the user to select “equity settings” relating to key equity-related parameters, including responsibility, capacity, and development need. These settings are then used, together with standard demographic and macroeconomic indicators (e.g., national population, GDP and carbon-intensity) to calculate implied national fair shares of the global mitigation effort. Importantly, this fair share is expressed as a sum of domestically- and internationally-supported mitigation.

We provide illustrative results for various alternative levels of ambition, for various equity settings, and for various estimates of national emissions reductions. We also show that the differences between the cases are much less significant than the similarities, and that a great deal of the detail can therefore be set aside in favor of an “equity band” that is bound by “High Equity Settings” on one side and “Low Equity Settings” on the other. We have defined this equity band to span a wide range of perspectives on fairness, though it is easier to argue that the “Low Equity Settings” are “too low” than it is that the “High Equity Settings” are “too high.”

For a short summary of the report (6 pages) see here.


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