Publications

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2021
Working Paper

Corporate Environmental Impact: Measurement, Data and Information

By: David Freiberg, DG Park, George Serafeim and T. Robert Zochowski

As an organization’s environmental impact has become a central societal consideration, thereby affecting industry and organizational competitiveness, interest in measuring and analyzing environmental impact has increased. We develop a methodology to derive comparable... View Details

Keywords: Environment; Impact; Measurement; Environmental Ratings; Corporate Valuation; Financial Materiality; Sustainability; Environmental Impact; Environmental Strategy; Impact-Weighted Accounts; IWAI; Environmental Sustainability; Corporate Social Responsibility and Impact; Measurement and Metrics; Valuation

SSRN

25 Feb 2009
Conference Presentation

New Research on Corporate Environmental Disclosure and Environmental Ratings

By: Michael W. Toffel

Keywords: Research; Corporate Disclosure; Natural Environment

March 2025
Case

Calyx Global: Rating Carbon Credits

By: Michael W. Toffel and Adam Chen

This case describes how rating agencies and other organizations are seeking to improve the quality of carbon credits sold in the voluntary carbon market to organizations seeking to use them to supplement their internal decarbonization efforts to meet their net zero... View Details

Keywords: Service Design; Certification; Auditing; Auditor Reputation; Carbon Credits; Carbon; Rating Agency Disagreement; Ratings; Climate Change; Business Model; Environmental Sustainability; Corporate Social Responsibility and Impact; Conflict of Interests; Reputation; Business Strategy

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September 2023
Article

Stock Price Reactions to ESG News: The Role of ESG Ratings and Disagreement

By: George Serafeim and Aaron Yoon

We investigate whether ESG ratings predict future ESG news and the associated market reactions. We find that the consensus rating predicts future news, but its predictive ability diminishes for firms with large disagreement between raters. Relation between news and... View Details

SSRN

January 2022
Article

Why is Corporate Virtue in the Eye of The Beholder? The Case of ESG Ratings

By: Dane Christensen, George Serafeim and Anywhere Sikochi

Despite the rising use of environmental, social, and governance (ESG) ratings, there is substantial disagreement across rating agencies regarding what rating to give to individual firms. As what drives this disagreement is unclear, we examine whether a firm’s ESG... View Details

Keywords: ESG Ratings; Rating Agency Disagreement; ESG Disclosure; Corporate Social Responsibility; Sustainability; Corporate Social Responsibility and Impact; Environmental Sustainability; Corporate Disclosure

08 Sep 2008
HBS Case

The Value of Environmental Activists

There are many methods, most financial, to measure the success of companies in meeting goals. But the question becomes a lot harder at Harvard Business School when MBAs are challenged to measure the efforts of environmental organizations like Greenpeace and the World... View Details

Keywords: by Sarah Jane Gilbert; Energy; Utilities

September 2010
Article

How Firms Respond to Being Rated

By: Aaron K. Chatterji and Michael W. Toffel

While many rating systems seek to help buyers overcome information asymmetries when making purchasing decisions, we investigate how these ratings also influence the companies being rated. We hypothesize that ratings are particularly likely to spur responses from firms... View Details

Keywords: System; Information; Decisions; Cost; Opportunities; Performance; Business and Stakeholder Relations; Economics; Theory; System Shocks; Rank and Position

11 Oct 2007
Working Paper Summaries

How Firms Respond to Being Rated

Keywords: by Aaron K. Chatterji & Michael W. Toffel

06 Jan 2012
Op-Ed

Where Green Corporate Ratings Fail

environmental record is actually quite mixed. But you wouldn't know it from environmental ratings and rankings that claim to highlight the most View Details

Keywords: by Michael Toffel & Auden Schendler; Information; Publishing

08 May 2020
Working Paper Summaries

Corporate Environmental Impact: Measurement, Data and Information

Keywords: by George Serafeim, DG Park, David Freiberg, and T. Robert Zochowski

09 Feb 2007
Working Paper Summaries

Do Corporate Social Responsibility Ratings Predict Corporate Social Performance?

Keywords: by Aaron K. Chatterji, David I. Levine & Michael W. Toffel

Article

How Well Do Social Ratings Actually Measure Corporate Social Responsibility?

By: Aaron K. Chatterji, David I. Levine and Michael W. Toffel

Ratings of corporations' environmental activities and capabilities influence billions of dollars of "socially responsible" investments as well as some consumers, activists, and potential employees. In one of the first studies to assess these ratings, we examine how... View Details

Keywords: Governance Compliance; Governing Rules, Regulations, and Reforms; Measurement and Metrics; Corporate Social Responsibility and Impact; Performance Effectiveness; Natural Environment; Pollutants

13 Apr 2015
Working Paper Summaries

Implied Materiality and Material Disclosures of Credit Ratings

Keywords: by Robert G. Eccles & Tim Youmans; Financial Services; Accounting

Fast Answer

Bloomberg: environmental social and governance (ESG)

What are some of the ESG commands and information available in Bloomberg? Type ESG <GO> to find ESG ratings by company. Type a ticker into the amber box to start your search. You can export the results to Excel. Type... View Details

29 Jan 2019
Research & Ideas

'Green Bonds' May Be Our Best Bet for Environmental Damage Control

Municipalities have been selling bonds to pay for public works projects—fire stations, parking garages,sewage treatment systems—for 200 years. It’s only in the past decade or so, however, that they’ve been selling them with an extra perk: helping the environment. In... View Details

Keywords: by Michael Blanding; Energy; Utilities; Construction; Green Technology; Public Administration

07 Sep 2020
News

Where ESG Ratings Fail: The Case for New Metrics

26 Apr 2011
Op-Ed

HBS Faculty Comment on Environmental Issues for Earth Day

Earth Day focuses the world's attention on the both the dangers and opportunities facing the planet. But sustainability and the intersection between business and the environment are issues that need to be addressed all the time, as cities grow, resources diminish, and... View Details

Keywords: by Staff; Energy; Utilities

January 2024 (Revised May 2024)
Case

PortageBay and ESG Analytics

By: Vikram S. Gandhi and Radhika Kak

In 2023, sustainable investors faced several challenges. The first was the lack of access to standardized and vetted environmental, social, and governance (ESG) data, and equally, the interpretation of this data into investment-useful insights. Reducing reliance on... View Details

Keywords: ESG Ratings; Investment Funds; Governance; Environmental Sustainability; Corporate Social Responsibility and Impact