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26.08.2020 - Working Paper

Measuring and Managing Carbon Risk in Investment Portfolios

This article studies the impact of carbon risk on stock pricing. To address this, we consider the seminal approach of Görgen et al. (2019), who proposed estimating the carbon financial risk of equities by their carbon beta. To achieve this, the primary task is to develop a brown-minus-green (or BMG) risk factor, similar to Fama and French (1992). Secondly, we must estimate the carbon beta using a multi-factor model. While Görgen et al. (2019) considered that the carbon beta is constant, we propose a time-varying estimation model to assess the dynamics of the carbon risk. Moreover, we test several specifications of the BMG factor to understand which climate change-related dimensions are priced in by the stock market. In the second part of the article, we focus on the carbon risk management of investment portfolios. First, we analyze how carbon risk impacts the construction of a minimum variance portfolio. As the goal of this portfolio is to reduce unrewarded financial risks of an investment, incorporating the carbon risk into this approach fulfils this objective. Second, we propose a new framework for building enhanced index portfolios with a lower exposure to carbon risk than capitalization-weighted stock indices. Finally, we explore how carbon sensitivities can improve the robustness of factor investing portfolios.

Théo RONCALLI, Theo LE GUENEDAL, Fréderic LEPETIT, Thierry RONCALLI, Takaya SEKINE

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Measuring and Managing Carbon Risk in Investment Portfolios

Markets scenarios & risks - March 2020

Macroeconomic picture - March 2020

Top Risk Map - February 2020

Risk factors, Macroeconomic context and forecasts - January 2020

Risk factors, Macroeconomic context and forecasts - December 2019

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Risk factors, Macroeconomic context and forecasts - October 2019

Risk factors, Macroeconomic context and forecasts - September 2019

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