Michael W. Toffel - Publications - Faculty & Research - Harvard Business School

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September 2023
Background Note

Amager Bakke: Municipal Waste to Energy

By: Willy Shih, Michael W. Toffel and Kelsey Carter

This background note describes the Amager Bakke waste-to-energy (WtE) plant in Copenhagen, which merges traditional waste incineration with a combined heat and power (CHP) plant and air pollution control (scrubbing) technology, and had plans to add carbon dioxide (CO2)... View Details

August 2023 (Revised July 2024)
Technical Note

Power-to-X

By: Willy Shih, Michael W. Toffel and Kelsey Carter

To reduce greenhouse gas emissions that were contributing to climate change, the world needs to transition from fossil fuels to renewable energy sources. Power-to-X (PtX) refers to an array of processes that convert electricity (power) to various gaseous and liquid... View Details

Keywords: Environmental Strategies; Climate Change; Environmental Sustainability; Transition; Renewable Energy; Energy Industry

August 2023 (Revised January 2024)
Supplement

Arla Foods: Data-Driven Decarbonization (A)

By: Michael Parzen, Michael W. Toffel, Amram Migdal and Susan Pinckney

Arla implemented a data-based price incentive system to measure, track, and influence climate friendly changes to reduce CO2 emissions across the world’s fourth largest dairy cooperative. View Details

Keywords: Dairy Industry; Business Earnings; Earnings Management; Environmental Accounting; Agribusiness; Animal-Based Agribusiness; Acquisition; Mergers and Acquisitions; Decision Making; Decisions; Voting; Environmental Management; Climate Change; Environmental Regulation; Environmental Sustainability; Green Technology; Pollution; Moral Sensibility; Values and Beliefs; Financial Strategy; Price; Profit; Revenue; Food; Geopolitical Units; Global Strategy; Ownership Type; Cooperative Ownership; Performance Efficiency; Performance Evaluation; Problems and Challenges; Natural Environment; Science-Based Business; Business Strategy; Commercialization; Cooperation; Corporate Strategy; Food and Beverage Industry; Agriculture and Agribusiness Industry; Europe; United Kingdom; European Union; Germany; Denmark; Sweden; Luxembourg; Belgium

August 2023 (Revised March 2024)
Case

Arla Foods: Data-Driven Decarbonization (A)

By: Michael Parzen, Michael W. Toffel, Susan Pinckney and Amram Migdal

The case describes Arla’s history, in particular its climate change mitigation efforts, and how it implemented a price incentive system to motivate individual farms to implement scope 1 greenhouse gas emissions mitigation measures and receive a higher milk price. The... View Details

August 2023 (Revised January 2024)
Supplement

Arla Foods: Data-Driven Decarbonization (B)

By: Michael Parzen, Michael W. Toffel, Susan Pinckney and Amram Migdal

The case describes Arla’s history, in particular its climate change mitigation efforts, and how it implemented a price incentive system to motivate individual farms to implement scope 1 greenhouse gas emissions mitigation measures and receive a higher milk price. The... View Details

July 2023 (Revised May 2024)
Case

Vytal: Packaging-as-a-Service

By: George Serafeim, Michael W. Toffel, Lena Duchene and Daniela Beyersdorfer

The Germany-based startup Vytal operated the largest digital-native reusable packaging-as-a-service network globally, having raised nearly €15 million, established a large network of restaurant partners, and prevented the use of millions of single-use take-out food... View Details

2025
Working Paper

Managing Remote Work Quality: Evidence from Auditing Management Systems Standards

By: Ashley Palmarozzo, Michael W. Toffel and Melissa Ouellet

Remote work has become more common, providing operational flexibility and productivity benefits, but questions remain about whether and how it affects work quality. We investigate the quality effects of remote work in a context in which remote work separates workers... View Details

Keywords: Audit; Auditing; Remote Work; Compliance; Assessment; Environment; Management Systems; Quality Management; Quality Management System; Quality; Operations; Supply Chain Management; Environmental Management; Safety

July 2023 (Revised January 2025)
Teaching Note

Sian Flowers: Fresher by Sea?

By: Willy Shih and Michael W. Toffel

July 2023
Supplement

Sian Flowers: Fresher by Sea? – PowerPoint Supplement

By: Willy C. Shih and Michael W. Toffel

July 2023
Technical Note

Agricultural Innovation and Sustainability in the Netherlands

By: Willy C. Shih, Michael W. Toffel, Kelsey Carter, Jennifer Godfrey, Rafaella Mazza and Katrina Yeh

This note describes some of the most significant agricultural innovations in the Netherlands, their drivers, environmental performance implications, some challenges facing the sector, and the potential replicability of these innovations to other contexts. View Details

Keywords: Agricultural; Decarbonization; Farming; Agribusiness; Science; Research and Development; Climate Change; Environmental Sustainability; Innovation and Invention; Agriculture and Agribusiness Industry; Netherlands

2024
Working Paper

Second- versus Third-party Audit Quality: Evidence from Global Supply Chain Monitoring

By: Maria R. Ibanez, Ashley Palmarozzo, Jodi L. Short and Michael W. Toffel

Capitalizing on the superior credibility and flexibility and potential lower cost of external assessments, many global buyers are relying less on their own employee (“second-party”) auditors and more on third-party auditors to monitor and prevent environmental and... View Details

Keywords: Auditing; Audit Quality; Working Conditions; Sustainability; Empirical Operations; Empirical Service Operations; Sustainability Management; Corporate Accountability; Corporate Social Responsibility and Impact; Supply Chain Management

May 2023 (Revised November 2023)
Case

Arcos Dorados: Decarbonizing McDonald's in Latin America

By: George Serafeim, Michael W. Toffel, Jenyfeer Martinez Buitrago and Mariana Cal

This case describes the decarbonization strategy of Arcos Dorados—McDonald’s largest independent franchisee, operating in 20 countries and territories in Latin America and the Caribbean—and how the company measured its greenhouse gas (GHG) emissions, including those... View Details

Keywords: Environmental Accounting; Animal-Based Agribusiness; Plant-Based Agribusiness; Change Management; Forecasting and Prediction; Environmental Sustainability; Food; Growth Management; Supply Chain; Corporate Social Responsibility and Impact; Strategy; Agriculture and Agribusiness Industry; Food and Beverage Industry; Green Technology Industry; Consumer Products Industry; Latin America; North and Central America; South America

April 2023 (Revised October 2023)
Supplement

Driving Decarbonization at BMW – Instructor Spreadsheet Supplement

By: Shirley Lu, George Serafeim and Michael W. Toffel

January 2023
Supplement

Global Sourcing at Nike

By: Nien-hê Hsieh and Michael W. Toffel

Powerpoint Supplement for “Global Sourcing at Nike,” HBS No. 619-008 View Details

December 2022 (Revised October 2023)
Supplement

Driving Decarbonization at BMW – Student Spreadsheet Supplement

By: Shirley Lu, George Serafeim and Michael W. Toffel

December 2022
Supplement

Driving Decarbonization at BMW - Video Supplement

By: Shirley Lu, George Serafeim and Michael W. Toffel

Videos of Thomas Becker, Vice President of Sustainability and Mobility at BMW Group, in support of the case "Driving Decarbonization at BMW" (HBS No. 123-008) View Details

November 2022 (Revised March 2023)
Supplement

JUUL and the Vaping Revolution: A 2022 Update

By: Michael W. Toffel and Sarah Mehta

This slide deck provides a brief update (2019-2022) on the rise and fall of JUUL Labs, the maker of the popular JUUL e-cigarette. View Details

November 2022 (Revised March 2023)
Supplement

JUUL and the Vaping Revolution: A 2022 Update

By: Michael W. Toffel and Sarah Mehta

This case provides a brief update (2019-2022) on the rise and fall of JUUL Labs, the maker of the popular JUUL e-cigarette. View Details

November 2022 (Revised April 2025)
Teaching Note

Driving Decarbonization at BMW

By: Shirley Lu, George Serafeim and Michael W. Toffel

Teaching note in support of the case "Driving Decarbonization at BMW" (HBS No. 123-008) View Details

October 2022 (Revised July 2025)
Case

Driving Decarbonization at BMW

By: Shirley Lu, George Serafeim and Michael W. Toffel

The case describes BMW’s electrification and decarbonization strategy, and how the company measured carbon emissions throughout the life cycle of its vehicles and used tools like carbon abatement cost curves to evaluate decarbonization opportunities. In mid-2022,... View Details

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