Blind to carbon risk? An analysis of stock market reaction to the Paris Agreement

• Published in: Ecological economics Vol. 170; p. 106571
• Main Authors: Monasterolo, Irene, de Angelis, Luca
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2020
• Subjects: Asset pricing; Carbon-intensive indices; Fama-French five-factor model; Low-carbon indices; Market model; Markowitz's portfolio optimization; Paris Agreement announcement; Risk-adjusted return; Stranded assets; Systematic risk; C22; Fama-French five-factor model; C58; Paris Agreement announcement; Systematic risk; Low-carbon indices; Risk-adjusted return; Q54; Markowitz's portfolio optimization; Stranded assets; Market model; Carbon-intensive indices; Asset pricing
• ISSN: 0921-8009; 1873-6106
• DOI: 10.1016/j.ecolecon.2019.106571

It is increasingly recognized that a transition to sustainable finance is crucial to scale up the low-carbon investments needed to achieve the global climate targets. A main barrier to portfolios' decarbonization is the lack of conclusive evidence on whether low-carbon investments add value to a portfolio, and on whether markets react to climate announcements by rewarding (penalizing) low-carbon (carbon-intensive) assets. To fill this gap, we develop an empirical analysis of the low-carbon and carbon-intensive indices for the EU, US and global stock markets. We test if financial markets are pricing the Paris Agreement (PA) by decreasing (increasing) the systematic risk and increasing (decreasing) the portfolio weights of low-carbon (carbon-intensive) indices afterwards. We find that after the PA the correlation among low-carbon and carbon-intensive indices drops. The overall systematic risk for the low-carbon indices decreases consistently, while stock markets' reaction is mild for most carbon-intensive indices. Moreover, the weight of the low-carbon indices within an optimal portfolio tends to increase after the PA. This evidence suggests that stock market investors have started to consider low-carbon assets as an appealing investment opportunity after the PA but have not penalized yet carbon-intensive assets.