We examine the impact of a disclosure mandate for greenhouse gas emissions on firms’ subsequent emission levels and financial operating performance. For UK-incorporated listed firms a carbon disclosure mandate was adopted in 2013. Our difference-in-differences design shows that firms affected by the mandate reduced their emissions by about 8% relative to a control group of European firms. At the same time, our tests indicate that the treated firms experienced no significant changes in their gross margins. Taken together, our findings indicate that the reporting mandate had a real effect on the variable to be disclosed without adversely affecting the financial operating performance of the treated firms.

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We examine whether mandatory disclosure of greenhouse gas (GHG) emissions influences companies' GHG emission levels. We identify the disclosure effect by exploiting a mandate requiring UK-incorporated listed companies to disclose information on GHG emissions in their annual reports. Using a difference-indifferences design, we show that disclosing GHG emissions in annual reports reduces emission levels by about 18% over three years. We find that emission reductions primarily occur for first-time mandatory reporters compared to firms who already voluntarily reported GHG information prior to the mandate. Further, we find that the emission reductions are permanent rather than transitory and we obtain stronger results for firms with larger savings potentials. Our effects are robust to various sample specifications, i.e., analysis at the installation-and firm-level, alternative control groups, and propensity score matching.

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