Publications

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

December 15, 2023
Article

What Every Leader Needs to Know About Carbon Credits

By: Varsha Ramesh Walsh and Michael W. Toffel

Many companies have begun to look into credits to offset their emissions as a way to support their net zero goals as their target years get closer and closer. As it stands, the carbon credit market is too small to bear the brunt of reducing companies’ impacts on the... View Details

Keywords: Carbon Credits; Climate; Accounting; Carbon Offsetting; Carbon Abatement; Carbon Emissions; Carbon Footprint; Climate Change; Environmental Accounting; Environmental Regulation

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January 2023
Case

EKI Energy Services: One Billion Carbon Credits

By: George Serafeim

Within nine months from the time of its Initial Public Offering (IPO) in April of 2021, EKI Energy Services (EKI) shares had increased by more than 8,000%. Equally explosive was the growth of the company’s revenues and Earnings Before Interest, Taxes and Depreciation... View Details

Keywords: Carbon Credits; Carbon Emissions; Growth; Business Analysis; Environmental Sustainability; Corporate Valuation; Climate Change; Accounting; Valuation; Transition; Renewable Energy; Analysis; Product Positioning; India

May 2025
Teaching Note

Calyx Global: Rating Carbon Credits

By: Michael W. Toffel and Adam Chen

Teaching note to support the Calyx Global: Ratinng Carbon Credits case (HBS No. 625-102) View Details

08 Jun 2011
Lessons from the Classroom

Twenty-first Century Skill: Trading Carbon Credits

Cap and trade has become an increasingly popular mechanism used by governments to induce green behavior among corporate polluters, with news emerging almost daily. Just recently New Jersey Governor Chris Christie withdrew his state from the Regional Greenhouse Gas... View Details

Keywords: by Julia Hanna; Energy; Utilities

October 2023 (Revised March 2024)
Case

KOKO Networks: Bridging Energy Transition and Affordability with Carbon Financing

By: George Serafeim, Siko Sikochi and Namrata Arora

The problem was massive: two million hectares of African forests were lost annually to charcoal production for cooking, an area equivalent to 13 times Greater London, resulting in one billion tons of carbon emissions yearly. At the same time, an estimated 700,000... View Details

15 Dec 2023
News

What Every Leader Needs to Know About Carbon Credits

01 Apr 2025
News

Calyx Global: Improving the Quality of Carbon Credits

June 2024
Teaching Plan

Teaching Plan: EKI Energy Services: One Billion Carbon Credits

By: George Serafeim

Teaching Plan for HBS Case No. 123-060. View Details

07 May 2024
Blog Post

Opportunity to Offset Travel Emissions with Carbon Credits that Meet HBS Criteria

credits sold by projects that reduce GHG in the atmosphere and may also provide other societal benefits in areas such as equity and health. Not all carbon credits used for... View Details

June 2008 (Revised October 2008)
Case

International Carbon Finance and EcoSecurities

By: Andre F. Perold, Forest L. Reinhardt and Mikell Hyman

In late 2007, EcoSecurities had to decide whether to undertake a new Clean Development Mechanism (CDM) project in China. EcoSecurities was an aggregator of carbon credits and also invested directly in projects that produced carbon credits. Governments and firms... View Details

Keywords: Non-Renewable Energy; Cost Management; Investment Return; Business and Government Relations; Risk and Uncertainty; Investment; Cash Flow; Valuation; Pollutants; Environmental Sustainability; Financial Services Industry; China

09 Apr 2025
Podcast

Carbon Credit Ratings and Market Integrity: A Conversation on the Calyx Global Case

In this bonus episode of Climate Rising, we share an episode from Harvard Business School’s Cold Call podcast, featuring HBS professor Mike Toffel and Duncan van Bergen, Co-Founder of Calyx Global. The discussion focuses on Mike’s recent HBS case study, Calyx Global:... View Details

17 Nov 2015
News

Carbon Neutral

to drive a cheaper car, or insulate their house and be a little more energy efficient,” says Minnick. At the same time, however, the plan would use the extra revenues generated from the carbon fee to issue a tax View Details

Keywords: Michael Blanding

12 Feb 2025
Video

Strengthening Carbon Claims via the Voluntary Carbon Markets Integrity Initiative (VCMI): A Conversation with Mark Kenber

24 Mar 2025
Video

Climate Rising Episode 6 | Voluntary Carbon Markets Series: A Conversation with Luke Leslie of Key Carbon

November 2008 (Revised March 2009)
Case

South Pole Carbon Asset Management-Going for Gold?

By: Forest L. Reinhardt, Jost Hamschmidt and Mikell Hyman

In late 2008, Christoph Sutter, CEO of South Pole Carbon Asset Management, reflects on his firm's early success at originating carbon credits in developing nations and selling them to governments and firms that seek to offset their greenhouse gas emissions voluntarily... View Details

Keywords: Developing Countries and Economies; Non-Renewable Energy; Entrepreneurship; Governing Rules, Regulations, and Reforms; Environmental Sustainability; Corporate Strategy

April 2024 (Revised October 2024)
Case

New Belgium Brewing and Climate Change

By: Michael W. Toffel, Kenneth P. Pucker and Michael Norris

In 2023, Colorado-based craft brewery New Belgium Brewing was considering how best to meet its emissions reduction targets. After decades of growth, the beermaker had grown to become one of the largest craft brewers in the U.S., and was purchased in 2019 by Japanese... View Details

Keywords: Beer; Carbon Accounting; Carbon Credits; Operation Management; Renewable Energy; Supply Chain; Environmental Sustainability; Climate Change; Corporate Social Responsibility and Impact; Environmental Accounting; Food and Beverage Industry; United States; Colorado

November 2023
Case

Gabon Special Economic Zone

By: John Macomber and Wale Lawal

Tropical rain forest covers about 80% of the West African nation of Gabon, part of the Congo Basin and the "lungs of the world." Gabon is one of the first nations to earn revenue from carbon sequestration...as long as the rain forest remains intact. There are... View Details

Keywords: Economic Development; Forestry; Wood; Carbon Credits; Supply Chain; Economic Growth; Developing Countries and Economies; Climate Change; Environmental Sustainability; Government Administration; Business and Government Relations; Strategy; Forest Products Industry; Africa; Gabon