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    • All HBS Web  (187)
      • Faculty Publications  (16)

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      • 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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      Toffel, Michael W., and Adam Chen. "Calyx Global: Rating Carbon Credits." Harvard Business School Case 625-102, March 2025.
      • March 2025 (Revised June 2025)
      • Background Note

      Getting to Net Zero: The Role of the Financial Sector

      By: Shawn Cole, Jonah Zahnd, Karina Chung and Jack Cenovic
      In early 2025, momentum towards the goal of reaching net zero carbon emissions by 2050 continued in many parts of the world, even as it appeared to face a set-back following the election of Donald Trump as president of the United States. Financial institutions... View Details
      Keywords: Transition; Climate Change; Environmental Regulation; Environmental Law; Corporate Social Responsibility and Impact; Risk and Uncertainty; Competitive Advantage; Financial Services Industry
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      Cole, Shawn, Jonah Zahnd, Karina Chung, and Jack Cenovic. "Getting to Net Zero: The Role of the Financial Sector." Harvard Business School Background Note 225-066, March 2025. (Revised June 2025.)
      • January 2025
      • Case

      GE Appliances 2025: Energizing Change

      By: Rosabeth Moss Kanter and Jacob A. Small
      At the turn of 2025, Kevin Nolan, CEO of GE Appliances following its acquisition by Chinese appliance giant Haier in 2016, is reviewing progress toward his net zero carbon vision for homes, which would otherwise exacerbate the global warming climate crisis. An... View Details
      Keywords: Mergers and Acquisitions; Transformation; Climate Change; Environmental Sustainability; Technological Innovation; Leading Change; Product Development; Organizational Culture
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      Kanter, Rosabeth Moss, and Jacob A. Small. "GE Appliances 2025: Energizing Change." Harvard Business School Case 325-089, January 2025.
      • September 2024
      • Case

      Copenhagen Infrastructure Partners: Leading the Energy Transition

      By: John Macomber and Maxwell Nii Laryea
      A leading global infrastructure fund debates whether and when to become engaged in the electrolysis and distribution of hydrogen, as part of the hydrogen economy and the global transtion to a net zero energy world. The proposed billion dollar project consists of wind... View Details
      Keywords: Infrastructure; Energy Generation; Renewable Energy; Project Finance; Decision Making; Risk and Uncertainty; Energy Industry; Spain
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      Macomber, John, and Maxwell Nii Laryea. "Copenhagen Infrastructure Partners: Leading the Energy Transition." Harvard Business School Case 225-012, September 2024.
      • January 2024
      • Case

      Net Zero Insurance Alliance: An Alliance in Crisis

      By: Peter Tufano and Karina Val
      The Net Zero Insurance Alliance (NZIA), a UN-convened alliance of major global insurers, was formed in 2021, but by 2023 had lost over 60% of its members. While NZIA had enjoyed a rapid and productive start by setting standards for the industry and sharing best... View Details
      Keywords: Climate Change; Insurance; Standards; Alliances; Business and Government Relations; Cooperation; Insurance Industry
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      Tufano, Peter, and Karina Val. "Net Zero Insurance Alliance: An Alliance in Crisis." Harvard Business School Case 324-063, January 2024.
      • January 2024 (Revised January 2025)
      • Case

      Colbún and Chile's Energy Transition

      By: Forest Reinhardt, Jenyfeer Martinez Buitrago and Mariana Cal
      In May 2023, Colbún, Chile’s second-largest electricity generator, plans capacity expansions using renewable energy and storage. This strategy supports Chile’s commitment to carbon neutrality (also known as net zero emissions) by 2050. The case delves into the... View Details
      Keywords: Transition; Energy Generation; Renewable Energy; Climate Change; Investment; Governing Rules, Regulations, and Reforms; Infrastructure; Organizational Change and Adaptation; Expansion; Business Strategy; Energy Industry; Utilities Industry; Latin America; South America; Chile
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      Reinhardt, Forest, Jenyfeer Martinez Buitrago, and Mariana Cal. "Colbún and Chile's Energy Transition." Harvard Business School Case 724-026, January 2024. (Revised January 2025.)
      • 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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      Ramesh Walsh, Varsha, and Michael W. Toffel. "What Every Leader Needs to Know About Carbon Credits." Harvard Business Review Digital Articles (December 15, 2023).
      • November 2023 (Revised June 2025)
      • Case

      Aviva plc: Examining Net Zero

      By: Peter Tufano, Brian Trelstad and Matteo Gasparini
      The board of Aviva Plc, one of the world’s largest insurers, must review its climate risk exposures and evaluate next steps. Risk experts at the firm have conducted a robust set of analyses prepared for its regulator, the Bank of England, simulating how various climate... View Details
      Keywords: Analysis; Climate Change; Insurance; Governing and Advisory Boards; Risk Management; Adaptation; Financial Services Industry; Insurance Industry; Europe; United Kingdom
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      Tufano, Peter, Brian Trelstad, and Matteo Gasparini. "Aviva plc: Examining Net Zero." Harvard Business School Case 324-008, November 2023. (Revised June 2025.)
      • 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
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      Egan, Mark, and Peter Tufano. "Forecasting Climate Risks: Aviva’s Climate Calculus." Harvard Business School Case 224-025, September 2023. (Revised October 2024.)
      • June 2023
      • Case

      Investing in the Climate Transition at Neuberger Berman

      By: George Serafeim and Benjamin Maletta
      By mid-2023, Neuberger Berman (NB), an active asset manager, had grown its assets under management to about half a trillion dollars and took pride in its client centricity and innovative spirit. Responding to client demand for investment products that integrated... View Details
      Keywords: Carbon Emissions; Sustainability; Decarbonization; Performance; Risk Assessment; Opportunities; Environmental Sustainability; Carbon Footprint; Business Analysis; Investing; Regulation; Asset Management; Investment Strategy; Climate Change; Transition; Analysis; Product Positioning; Strategy; Investment Portfolio; Financial Services Industry; Energy Industry
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      Serafeim, George, and Benjamin Maletta. "Investing in the Climate Transition at Neuberger Berman." Harvard Business School Case 123-092, June 2023.
      • June 2022
      • Case

      PFA Pensions: The Climate Plus Product

      By: Daniel Green, Victoria Ivashina and Alys Ferragamo
      The case explores whether alternative investments play a unique role in achieving low carbon dioxide emissions at the portfolio level. This case is set in April of 2020 and follows Kasper Ahrndt Lorenzen, Chief Investment Officer, and Peter Tind Larsen, Head of... View Details
      Keywords: Carbon Emissions; Carbon Footprint; Alternative Assets; Alternative Investment Vehicles; Pension Fund Investing; Private Equity; Renewable Energy; Investment Portfolio; Corporate Social Responsibility and Impact; Environmental Sustainability; Denmark
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      Green, Daniel, Victoria Ivashina, and Alys Ferragamo. "PFA Pensions: The Climate Plus Product." Harvard Business School Case 222-088, June 2022.
      • June 2022 (Revised January 2023)
      • Case

      South Africa – a 'Just Energy Transition'

      By: Richard Vietor
      South Africa, like most other countries, is in the process of reducing its carbon emissions to comply with COP26 and, hopefully, reach net zero emissions by 2050. However, because South Africa relies almost wholly on coal (93%) for electricity, and on coal for... View Details
      Keywords: Energy; Economic Development; Climate Change; Coal Mining; Emission Reduction; Environmental Regulation; Environmental Sustainability; Environmental Law; Labor and Management Relations; Labor Unions; Natural Resources; Energy Policy; Energy Sources; South Africa
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      Vietor, Richard. "South Africa – a 'Just Energy Transition'." Harvard Business School Case 722-069, June 2022. (Revised January 2023.)
      • 2021
      • Working Paper

      Limits to Bank Deposit Market Power

      By: Juliane Begenau and Erik Stafford
      Claims about the market power of bank deposits in the banking literature are numerous and far reaching. Recently, a causal narrative has emerged in the banking literature: market power in bank deposits, measured as imperfect pass-through of short-term market rates on... View Details
      Keywords: Bank Deposits; Market Power; Net Interest Margin (NIM); Banks and Banking; Interest Rates; Risk and Uncertainty
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      Begenau, Juliane, and Erik Stafford. "Limits to Bank Deposit Market Power." Harvard Business School Working Paper, No. 22-039, November 2021.
      • May 2021
      • Teaching Plan

      Middlebury College: Energy2028

      By: Brian Trelstad and Michael Norris
      Teaching Plan for HBS Case No. 320-029. In 2018, Middlebury College’s board of trustees is considering a proposal called Energy2028 that would push the small, liberal arts and sciences college in Vermont to become a net zero carbon emitter, decrease energy usage by... View Details
      Keywords: Divestment; Energy; Higher Education; Energy Conservation; Climate Change
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      Trelstad, Brian, and Michael Norris. "Middlebury College: Energy2028." Harvard Business School Teaching Plan 321-144, May 2021.
      • April 2020 (Revised May 2021)
      • Case

      Middlebury College: Energy2028

      By: Brian Trelstad, Michael Norris and John McKinley
      In 2018, Middlebury College’s board of trustees is considering a proposal called Energy2028 that would push the small, liberal arts and sciences college in Vermont to become a net zero carbon emitter, decrease energy usage by 25%, divest fossil fuels from its... View Details
      Keywords: Divestment; Energy; Higher Education; Energy Conservation; Climate Change
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      Trelstad, Brian, Michael Norris, and John McKinley. "Middlebury College: Energy2028." Harvard Business School Case 320-029, April 2020. (Revised May 2021.)
      • April 1998 (Revised May 2001)
      • Supplement

      Acquisition of Consolidated Rail Corporation (B), The

      By: Benjamin C. Esty, Lori A. Flees and Mathew M Millett
      Eight days after CSX announced it was going to buy Consolidated Rail (Conrail) for $88.65 per share, Norfolk Southern made a hostile $100 per share bid for Conrail. Over the next several months, the potential acquirers upped their bids while exchanging criticism in the... View Details
      Keywords: Law; Valuation; Rail Transportation; Bids and Bidding; Governance Controls; Mergers and Acquisitions; Business Strategy; Corporate Finance; Rail Industry; United States
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      Esty, Benjamin C., Lori A. Flees, and Mathew M Millett. "Acquisition of Consolidated Rail Corporation (B), The." Harvard Business School Supplement 298-095, April 1998. (Revised May 2001.)
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