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(657)
- News (98)
- Research (378)
- Events (2)
- Multimedia (9)
- Faculty Publications (214)
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- March 2024 (Revised March 2025)
- Background Note
Physical Climate Risk
By: Michael W. Toffel, Spencer Glendon and Alison Smart
This note describes how managers can identify and manage their company’s physical climate risks, which can increase their operations and supply chain costs and risks, and affect demand for their goods and services. Can be paired with the video “Preparing business... View Details
- October 26, 2022
- Article
Climate Risk Is Growing. Is Your Company Prepared?
By: John D. Macomber
Most people don’t have a strategy for how to handle the worsening perils of flooding, wildfires and extreme heat. They should adopt a four-step process for protecting their property, whether it be a home or a business. First, they should prioritize how important... View Details
Macomber, John D. "Climate Risk Is Growing. Is Your Company Prepared?" Harvard Business Review Digital Articles (October 26, 2022).
- 2021
- Working Paper
Shareholder Activism and Firms’ Voluntary Disclosure of Climate Change Risks
By: Caroline Flammer, Michael W. Toffel and Kala Viswanathan
This paper examines whether—in the absence of mandated disclosure requirements—shareholder activism can elicit greater disclosure of firms’ exposure to climate change risks. We find that environmental shareholder activism increases the voluntary disclosure of climate... View Details
Keywords: Shareholder Activism; Climate Risk; Corporate Accountability; Climate Change; Corporate Disclosure; Corporate Governance; Corporate Social Responsibility and Impact; Business and Shareholder Relations; Risk and Uncertainty; Natural Environment; Environmental Sustainability; Financial Services Industry; United States
Flammer, Caroline, Michael W. Toffel, and Kala Viswanathan. "Shareholder Activism and Firms' Voluntary Disclosure of Climate Change Risks." Harvard Business School Working Paper, No. 20-049, October 2019. (Revised March 2021.)
- September 2023 (Revised October 2024)
- Case
Forecasting Climate Risks: Aviva’s Climate Calculus
By: Mark Egan and Peter Tufano
In late 2021, Ben Carr, Director of Analytics and Capital Modeling at Aviva Plc (Aviva)—a leading insurer with core operations in the UK, Ireland and Canada,—was preparing for an upcoming presentation before the company's board which included its CEO, Amanda Blanc,... View Details
Keywords: Climate Risk; Climate Finance; Forecasting; Insurance; Risk Measurement; Climate Change; Risk Management; Forecasting and Prediction; Insurance Industry; United States
Egan, Mark, and Peter Tufano. "Forecasting Climate Risks: Aviva’s Climate Calculus." Harvard Business School Case 224-025, September 2023. (Revised October 2024.)
- Forthcoming
- Article
Pricing of Climate Risk Insurance: Regulation and Cross-Subsidies
By: Ishita Sen, Ana-Maria Tenekedjieva and Sangmin Oh
We study the pricing of homeowners’ insurance, a $15 trillion market essential for hedging climate-related losses. We show that insurance premiums are subject to starkly different regulations across states, creating persistent cross-subsidies and price distortions. We... View Details
Keywords: Climate Risk; Homeowners' Insurance; Price Controls; Financial Regulation; Cross-subsidization; Climate Change; Price; Risk and Uncertainty; Geographic Location; Insurance Industry; United States
Sen, Ishita, Ana-Maria Tenekedjieva, and Sangmin Oh. "Pricing of Climate Risk Insurance: Regulation and Cross-Subsidies." Journal of Finance (forthcoming).
- January 2023
- Supplement
Organizational Climate Transition Risk Model
By: George Serafeim and Benjamin Maletta
- November 2023 (Revised February 2025)
- Background Note
Corporate Climate Targets
By: Willy C. Shih, Michael W. Toffel and Kelsey Carter
Companies that are addressing climate change by mitigating their greenhouse gas emissions often set reduction targets. This note describes several types of widely used carbon reduction targets, including carbon neutral, science based, net zero, real zero, and carbon... View Details
Keywords: Corporate Sustainability; Environmental Strategy; Climate Risk; Target-setting; Climate Change; Environmental Sustainability; Corporate Accountability; Policy; Measurement and Metrics; Strategic Planning; Social Issues; Corporate Social Responsibility and Impact
Shih, Willy C., Michael W. Toffel, and Kelsey Carter. "Corporate Climate Targets." Harvard Business School Background Note 624-041, November 2023. (Revised February 2025.)
- Research Summary
Climate Adaptation
By: John D. Macomber
It's clear that challenges like wildfires, river flooding, extreme heat, and storm surge are increasing. How will homeowners, businesses, instituations, goverments, and all of society decide what and whom to protect and what and whom to not protect? What is the timing?... View Details
- February 2023
- Article
Climate Solutions Investments
By: Alex Cheema-Fox, George Serafeim and Hui (Stacie) Wang
An increasing number of companies are providing products and services that help reduce carbon emissions in the economy. We develop a methodology to identify those companies and create a sample of publicly listed climate solutions companies allowing us to study their... View Details
Keywords: Decarbonization; Climate Finance; Climate Impact; Climate Risk; Environment; Sustainability; Carbon Emissions; Electric Vehicles; Energy; Renewables; Climate Change; Corporate Social Responsibility and Impact; Environmental Sustainability; Emerging Markets; Investment Portfolio
Cheema-Fox, Alex, George Serafeim, and Hui (Stacie) Wang. "Climate Solutions Investments." Journal of Portfolio Management 49, no. 3 (February 2023): 72–96.
- April 2025
- Article
How Central Banks Manage Climate and Energy Transition Risks
By: Esther Shears, Jonas Meckling and Jared Finnegan
Central banks have begun to examine and manage climate risks, including both transition risks of moving from fossil fuels to clean energy and physical climate risks. Here we provide a systematic assessment of how and why central banks address climate risks on the basis... View Details
Shears, Esther, Jonas Meckling, and Jared Finnegan. "How Central Banks Manage Climate and Energy Transition Risks." Nature Energy 10, no. 4 (April 2025): 470–478.
- Teaching Interest
Business Opportunties in Climate Adaptation
By: John D. Macomber
This is a Short Intensive Program or SIP at Harvard Business School. It’s an optional student offering prior to the formal start of the Spring semester the following week. SIPs tend to cover new material on current topics, to be less formal than the HBS Case Study... 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
Keywords: Climate Impact; Online Courses; Online Education; Decarbonization; Mitigation Policies; Climate Risk; Climate Change; Risk Management; Science; Policy; Business Education; Adaptation
Toffel, Michael W. "Educating Students and Professionals on the Business Implications of Climate Change." Global Focus: The EFMD Business Magazine 192, no. 2 (2025): 29–32.
- 2013
- Case
Travelers Insurance: Focusing on Climate Change and Natural Catastrophe Risk
By: Andrew J. Hoffman
The dilemma Evan Blue faces stems from a report by sustainability advocacy group Ceres that calls on companies to take climate change into consideration in their risk models and develop response strategies. The fictional vice president of Traveler's Insurance is tasked... View Details
Hoffman, Andrew J. "Travelers Insurance: Focusing on Climate Change and Natural Catastrophe Risk." William Davidson Institute Case 1-429-347, 2013.
- October 2021
- Article
Shareholder Activism and Firms' Voluntary Disclosure of Climate Change Risks
By: Caroline Flammer, Michael W. Toffel and Kala Viswanathan
This paper examines whether—in the absence of mandated disclosure requirements—shareholder activism can elicit greater disclosure of firms’ exposure to climate change risks. We find that environmental shareholder activism increases the voluntary disclosure of climate... View Details
Keywords: Transparency; Reporting; Shareholder Engagement; Shareholder Activism; Climate Change; Risk and Uncertainty; Environmental Management; Investment Activism; Corporate Disclosure; Communication Strategy; Information Publishing; Measurement and Metrics; Corporate Social Responsibility and Impact; Problems and Challenges; United States
Flammer, Caroline, Michael W. Toffel, and Kala Viswanathan. "Shareholder Activism and Firms' Voluntary Disclosure of Climate Change Risks." Strategic Management Journal 42, no. 10 (October 2021): 1850–1879. (Featured in Harvard Business Review.)
- 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
- May 2022
- Teaching Note
Climate Action in Miami
By: Rosabeth Moss Kanter and Catarina Martinez
Teaching Note for HBS Case No. 322-101. The Miami metropolitan area is a global epicenter of climate risk from heat and sea level rise, but leaders have only recently mobilized for action to respond to this systemic challenge. Resilient 305 began a collaboration across... View Details
- March 2022 (Revised July 2022)
- Case
Climate Action in Miami
The Miami metropolitan area is a global epicenter of climate risk from heat and sea level rise, but leaders have only recently mobilized for action to respond to this systemic challenge. Resilient 305 began a collaboration across officials in the cities of Miami and... View Details
Keywords: Climate Change; Climate Impact; Change; Leadership; Cross-sector Collaboration; Coalition; Ecosystem; Greenhouse Gas Emissions; Green Business; Adaptation; Environmental Sustainability; Infrastructure; Green Technology; Environmental Management; Miami
Kanter, Rosabeth Moss. "Climate Action in Miami." Harvard Business School Case 322-101, March 2022. (Revised July 2022.)
- 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
- Teaching Interest
Cities, Structures, and Climate Shocks
By: John D. Macomber
This course is about building sustainable and resilient cities, future proofing real estate and infrastructure assets, and examining how businesses and investors find opportunities in climate adaptation.
The world faces substantial challenges in the face of... View Details
- 13 Nov 2019
- Working Paper Summaries