A recent study by researchers at the University of California (Davis and Berkeley) and the University of Otago in New Zealand entitled “The Relevance to Investors of Greenhouse Gas Emission Disclosure” has found that the amount of greenhouse gas (GHG) emissions a company produces and whether a company discloses their emission levels or not has a significant effect on the value of the company’s stock. In particular, the researchers found that the greater the GHG emissions, the lower the value of a company’s stock. Likewise, lower emission levels lead to higher stock values, all other factors being equal. Even if companies do not disclose this information, GHG emission levels are estimated by investors themselves, resulting in an even stronger risk discount to the stock value for high level emitters. This trend is particularly strong in energy intensive industry sectors. The study was led by Paul Griffin, a professor in the University of California, Davis Graduate School of Management.
Professor Griffin and his colleagues also discovered that markets respond almost immediately when a company releases information on their GHG emissions, with stock values responding the same day as the disclosure. “It really does appear to be a valuation factor,” Professor Griffin says. “Greenhouse gas emissions are important to investors in assessing companies.”
The findings bolster the arguments of investor groups, environmental advocates and watchdog organizations that have been seeking greater disclosure of company actions that affect climate change. The U.S. Securities and Exchange Commission (SEC) does not require all companies to report GHG emissions, but companies are required to disclose any information that is considered material to stock values. The findings of this study strongly suggest that GHG emissions data is relevant information to investors, therefore it could be argued that all public companies should disclose their GHG emissions to comply with SEC requirements. Approximately 50% of large U.S. firms report GHG emissions through the Carbon Disclosure Project.
The researchers analyzed four years of data (from 2006-2009) on firms listed in the Standard & Poor’s 500, and five years of data (2005-2009) for the top 200 publicly traded firms in Canada. While the researchers found the link between stock values and GHG emissions to hold true in most industries, the correlation was strongest for energy companies and utilities. According to Griffin, “after controlling for normal valuation factors like assets and earnings, we found the value of stocks to be a function of greenhouse gas emissions”.
Investors care about GHG emissions because markets are forward looking. Professor Griffin has indicated that in this case, investors are anticipating a time when companies will face increased costs for climate change mitigation, regulation and taxes.
The full study can be downloaded at Link.