Introduction to a New Era in Sustainable Finance
Long considered the ultimate indicator of sustainable finance, the static carbon footprint is showing its limitations. The new "Guide to Decarbonizing Financial Institutions in Tunisia" published by the CBF introduces a more nuanced approach: the "Green-Brown" metrics. This marks a small methodological revolution.
The Limitations of Traditional Carbon Footprint Analysis
In the race towards carbon neutrality, Tunisian financial institutions have long favored a snapshot approach: the carbon footprint of their portfolio. However, relying solely on current emissions can lead to major strategic errors. For example, a wind infrastructure project requires a carbon-intensive construction phase, but it is also a key driver of future decarbonization.
The "Green-Brown" Metrics: A New Approach
The traditional carbon footprint measures what is emitted "here and now". This accounting vision, if used alone, could push banks to disengage from critical industrial sectors that are undergoing significant changes. The risk is creating a "selection bias" where portfolios appear green simply because they avoid heavy sectors, without actually financing the energy transition that the Tunisian economy desperately needs. This is where the "Green-Brown" metrics come in.
The "Green-Brown" Segmentation
The concept of "Green-Brown" metrics allows for segmenting assets not by their current pollution, but by their contribution to the climate solution. This approach distinguishes three categories of assets:
- Brown assets: sectors with high emissions and no credible transition plan. They represent a long-term financial risk (stranded assets).
- Green assets: pure climate solutions, such as renewable energies or energy efficiency in buildings.
- Assets in transition: this is the most strategic category for Tunisia. It includes polluting companies that are investing heavily to change their economic model.
Why This Nuance is Crucial for Tunisia
For a Tunisian financial institution, the challenge is twofold. On the one hand, it is essential to valorize the transition effort: a cement industry that invests in low-consumption furnaces may have a high carbon footprint today, but it is a key player in the national decarbonization trajectory. On the other hand, it is crucial to better manage risks: the alignment metrics project future trajectories, allowing institutions to verify if a client is in line with global climate objectives (such as the Paris Agreement) or if it is becoming a liability for the bank's balance sheet.
Complementarity of Tools
The guide published in June 2025 is clear: emission metrics and alignment metrics do not oppose each other, they complement each other. While the former provides a current evaluation of the impact, the latter acts as a GPS to steer long-term strategy. By integrating these "Green-Brown" indicators, Tunisian banks are moving from a simple observation posture to a role of true driver of industrial transformation. In sustainable finance, the most important thing is no longer just knowing where we are, but where we are headed.
