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- 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
- April 2025
- Supplement
Arla Foods: Data-Driven Decarbonization (A) and (B) PowerPoint Supplement
By: Michael Parzen, Michael W. Toffel and Susan Pinckney
Arla implemented a data based price incentive systems to measure, track, and influence climate friendly changes to reduce CO2 emissions across the world’s fourth largest dairy cooperative. View Details
- April 2025
- Background Note
Climate Change Adaptation with Artificial Intelligence and Machine Learning
By: Michael W. Toffel and Nabig Chaudhry
Artificial Intelligence (AI) and machine learning (ML) have emerged as powerful tools to address climate change. This note summarizes a wide range of the uses of AI/ML to drive climate change adaptation and resilience, the measures organizations and governments are... View Details
- April 2025
- Teaching Note
Allbirds: Decarbonizing Fashion (A) and (B)
By: Michael W. Toffel, Ken Pucker and Stacy Straaberg
Teaching Note for HBS Case Nos. 622-024, 625-004, 625-005, and 625-702. The Allbirds: Decarbonizing Fashion (A) case introduces Allbirds as a footwear startup not only focused on simple design, comfort, and sustainable natural materials but on decarbonizing the wider... View Details
Keywords: Decarbonization; Climate Impact; Environmental Strategy; Innovation; Product Design; Supply Chain Management; Innovation Strategy; Innovation and Management; Product Development; Climate Change; Environmental Management; Environmental Sustainability; Business Startups; Initial Public Offering; Knowledge Sharing; Apparel and Accessories Industry; Fashion Industry; United States; California
- April 2025
- Supplement
Allbirds: Decarbonizing Fashion PowerPoint Supplement
By: Michael W. Toffel, Ken Pucker and Stacy Straaberg
The Allbirds: Decarbonizing Fashion (A) case introduces Allbirds as a footwear startup not only focused on simple design, comfort, and sustainable natural materials but on decarbonizing the wider fashion industry. Background material highlights the growing... View Details
Keywords: Decarbonization; Climate Impact; Environmental Strategy; Innovation; Product Design; Supply Chain Management; Innovation Strategy; Innovation and Management; Product Development; Climate Change; Environmental Management; Environmental Sustainability; Apparel and Accessories Industry; Fashion Industry; United States; California
- April 8, 2025
- Article
Creating Workplaces Free of Forever Chemicals
By: Joseph G. Allen, Heather A. Henrikson and Michael W. Toffel
Forever chemicals are toxic and widely used in buildings and yet they remain on the rise globally with little regulation to control them. In the United States, for example, Environmental Protection Agency (EPA) regulations currently cover only forever chemicals in... View Details
- March 2025
- Case
Hurtigruten: Sea Zero
By: Christian Kaps and Michael W. Toffel
Hurtigruten was deciding whether the next ship they built should be fully electric. But such a vessel's battery, the size of electric cars, needed to be charged on the ship's multi-day voyage along the Norwegian coast. Before making such a $250 million investment, the... View Details
Keywords: Energy Sources; Alternative Energy; Ship Transportation; Environmental Regulation; Environmental Sustainability; Innovation and Management; Green Technology; Investment; Corporate Social Responsibility and Impact; Shipping Industry; Tourism Industry; Transportation Industry; Travel Industry; Battery Industry; Norway; Europe
- 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
- February 2025
- Tutorial
Preparing Business Leaders for an Era of Climate Instability: Understanding and Managing Physical Climate Risk
By: Michael W. Toffel and Spencer Glendon
In this compelling video, Spencer Glendon, founder of Probable Futures and Executive Fellow at Harvard Business School, describes the profound implications of climate change for businesses, the economy, and societies around the world. Drawing from his background in... View Details
- 2025
- Article
Educating Students and Professionals on the Business Implications of Climate Change
As climate change poses unprecedented challenges and opportunities, the private sector must play a pivotal role in both adaptation and mitigation efforts. This article discusses the new Harvard Business School Online course, Business and Climate Change, designed to... View Details
- January 2025
- Teaching Note
Vytal: Packaging-as-a-Service
By: George Serafeim, Michael W. Toffel and Stacy Straaberg
Teaching Note for HBS Case No. 124-007. 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... View Details
Keywords: Environmental Sustainability; Innovation and Invention; Business Growth and Maturation; Growth and Development Strategy; Business Startups; Resource Allocation; Risk Management; Adoption; Strategy; Performance Productivity; Service Delivery; Service Operations; Supply Chain; Distribution; Entrepreneurship; Climate Change; Business Model; Governing Rules, Regulations, and Reforms; Profit; Financing and Loans; Expansion; Green Technology Industry; Service Industry; Retail Industry; Germany; Europe
- September 20, 2024
- Article
It’s Time to Unbundle ESG
By: Aaron K. Chatterji and Michael W. Toffel
ESG is at an inflection point. It has come to represent a broad and inchoate aspiration for what business should be doing beyond maximizing shareholder value. With ESG advocates on the defensive, business leaders need a new roadmap to determine which factors to... View Details
Keywords: ESG; ESG (Environmental, Social, Governance) Performance; ESG Ratings; ESG Reporting; ESG Disclosure; Sustainability; Climate; Climate Finance; Climate Risk; Social Accounting; Investment; Governance; Safety; Climate Change; Environmental Sustainability; Corporate Social Responsibility and Impact; Financial Services Industry
- 2024
- Working Paper
Empirical Guidance: Data Processing and Analysis with Applications in Stata, R, and Python
By: Melissa Ouellet and Michael W. Toffel
This paper describes a range of best practices to compile and analyze datasets, and includes some examples in Stata, R, and Python. It is meant to serve as a reference for those getting started in econometrics, and especially those seeking to conduct data analyses in... View Details
- July 2024 (Revised December 2024)
- Background Note
District Heating: An Overview
By: Willy Shih and Michael W. Toffel
This note provides an overview of district heating: systems in which central plants generate heat that is conveyed by steam or water through a set of insulated pipes to send heat to residential and/or commercial buildings. It describes key elements of the system (heat... View Details
- May 2024 (Revised May 2024)
- Case
Market by Met Council: Revolutionizing Food Pantries in the Digital Age
By: Elisabeth Paulson and Michael W. Toffel
In fall 2023, the Food Program of Met Council—America’s largest Jewish charity dedicated to fighting poverty—completed the rollout of the newest version of its digital pantry platform to twelve food pantries in the Met Council food pantry network. The digital... View Details
- May 2024
- Article
The Effect of Configural Processing on Mentalization
By: Katrina Fincher, Ting Zhang, Asteya Percaya, Adam Galinsky and Michael W. Morris
Eight studies (N = 2,561) reveal that how we perceptually process a person’s face affects our capacity to understand their mind. Studies 1A and B indicate this relationship functions via two separate pathways: (a) indirectly by increasing our sensitivity to the... View Details
- April 2024 (Revised April 2025)
- Supplement
Driving Decarbonization at BMW
- 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
- March 2024
- Article
Do Safety Management System Standards Indicate Safer Operations? Evidence from the OHSAS 18001 Occupational Health and Safety Standard
By: Kala Viswanathan, Matthew S. Johnson and Michael W. Toffel
Problem definition: Given the enormous disruptions and costs of occupational injuries, companies and buyers are increasingly looking to voluntary occupational health and safety standards to improve worker safety. Yet because these standards only require... View Details
- February 26, 2024
- Article
Making Workplaces Safer Through Machine Learning
By: Matthew S. Johnson, David I. Levine and Michael W. Toffel
Machine learning algorithms can dramatically improve regulatory effectiveness. This short article describes the authors' scholarly work that shows how the U.S. Occupational Safety and Health Administration (OSHA) could have reduced nearly twice as many occupational... View Details