A large number of studies has failed to date to identify a robust and economically significant climate risk premium or climate beta, either at the aggregate or at the sectoral level. Could it be that the markets have already impounded all the relevant information?; that markets expect limited damages?; or that damages are so far in the future to be irrelevant on a discounted basis? What if markets were not informationally efficient and were underestimating the potential impacts from climate change? The latter mispricing hypothesis leaves open the possibility of repricing, either in a gradual or in an abrupt way. We argue this is a novel source of risk, which should be on the radar screen of long-term investors.
Riccardo Rebonato, Scientific Director, EDHEC-Risk Climate Impact Institute and Professor of Finance, EDHEC Business School, reviews the merits of various market efficiency explanations for the elusive sensitivity of asset prices to climate risk and explore why current market prices may be underestimating the effects of climate risk on government revenues and the cashflows of companies. Topics covered include: