Publications

2023
Working Paper

Advances in Power-to-Gas Technologies: Cost and Conversion Efficiency

By: Gunther Glenk, Philip Holler and Stefan Reichelstein

Widespread adoption of hydrogen as an energy carrier is widely believed to require continued advances in Power-to-Gas (PtG) technologies. Here we provide a comprehensive assessment of the dynamics of system prices and conversion efficiency for three currently prevalent... View Details

Keywords: Clean Tech; Decarbonization; Carbon Emissions; Learning By Doing; Environment; Energy; Environmental Management; Sustainable Cities; Price; Energy Industry; Utilities Industry; Industrial Products Industry; Manufacturing Industry; Transportation Industry; Europe; North America; South America; Africa; Asia

SSRN

August 2021 (Revised May 2022)
Background Note

Oil: History, Present and Future

By: Jurgen Weiss

This background note is intended to provide context for a discussion of the strategies for big integrated oil companies in light of both oil’s current role in the global energy system and the uncertainty about changes going forward. View Details

Keywords: Oil; Energy Markets; Oil Prices; Oil Companies; Decarbonization; Non-Renewable Energy; Environmental Sustainability; Strategy; Globalized Markets and Industries

August 2021 (Revised April 2023)
Case

Dandelion: Making Geothermal Heat Pumps a Real Option

By: Jurgen Weiss

Keywords: Electricity Distribution; Decarbonization; Geothermal Electricity; Greenhouse Gas Emissions

June 2024
Simulation

Vehicle Lifecycle Emissions Calculator

By: Mike Toffel, Shirley Lu and George Serafeim

This Vehicle Lifecycle Emissions Calculator calculates the greenhouse gas emissions over the lifespan of internal combustion engine (ICEs) vehicles, battery electric vehicles (BEVs), and plug-in hybrid electric vehicles (PHEV), including those associated with their... View Details

Keywords: Decarbonization; Environment; Carbon Accounting; Carbon; Carbon Abatement; Electric Vehicles; Automobiles; Environmental Accounting; Environmental Management; Environmental Sustainability; Strategy; Technological Innovation; Supply Chain; Business and Stakeholder Relations; Climate Change; Transportation; Transportation Industry; Auto Industry; Battery Industry

2025
Article

Educating Students and Professionals on the Business Implications of Climate Change

By: Michael W. Toffel

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

May 2023
Case

CMA CGM: Reducing the Carbon Footprint of Container Shipping

By: Willy C. Shih and Emilie Billaud

Marine transport is the most cost-effective way to move large volumes over long distances, and container shipping is the backbone of international trade in goods. Yet shipping contributed 3% of worldwide greenhouse gas emissions, and the deep-sea segment, which... View Details

Keywords: Container Shipping; Logistic Regression; Trade Links; Decarbonization; Environmental Strategies; Environmental Impact; Globalization; Trade; Environmental Regulation; Logistics; Supply Chain; Governance Compliance; Shipping Industry; European Union; Asia; North America

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

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

SSRN

2023
Working Paper

Toward Decision-Useful Carbon Information

By: Gunther Glenk

Companies are increasingly viewed as crucial drivers for timely decarbonization. Current accounting practices for greenhouse gas (GHG) emissions, however, often leave corporate carbon disclosures and abatement obscured. Here I introduce a taxonomy for assuring the... View Details

SSRN

March 2020
Article

Synergistic Value in Vertically Integrated Power-to-Gas Energy Systems

By: Gunther Glenk and Stefan Reichelstein

In vertically integrated energy systems, integration frequently entails operational gains that must be traded off against the requisite cost of capacity investments. In the context of the model analyzed in this study, the operational gains are subject to inherent... View Details

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

March 2019
Article

Economics of Converting Renewable Power to Hydrogen

By: Gunther Glenk and Stefan Reichelstein

The recent sharp decline in the cost of renewable energy suggests that the production of hydrogen from renewable power through a power-to-gas process might become more economical. Here we examine this alternative from the perspective of an investor who considers a... View Details

Find at Harvard

17 Sep 2024
HBS Case

The Climate Targets Leaders Need to Know as Regulations Loom

As investor pressure mounts on companies to show their environmental impacts, leaders are encountering an unwieldy tangle of terms and approaches. Climate accounting basics and a dictionary of sorts can help demystify the calculations and voluntary targets that... View Details

Keywords: by Rachel Layne

June 2025
Case

Transforming a Titan (A)

By: George Serafeim and Lena Duchene

Dimitri Papalexopoulos, fourth-generation CEO of TITAN Cement, must decide whether to keep leading the 120-year-old, family-controlled firm or hand the reins to new management. Over 26 years he has turned TITAN from a domestic player into an internationally diversified... View Details

December 2022
Technical Note

Risks and Opportunities from the Transition to a Low Carbon Economy: A Business Analysis Framework

By: George Serafeim

The transition to a low carbon economy introduces many risks and opportunities for businesses. Risks emerge from regulatory actions, such as carbon taxes and cap and trade systems, technological innovation that develop alternatives for customers making existing... View Details

Keywords: Risk Assessment; Opportunities; Environmental Sustainability; Carbon Footprint; Risk Management; Competitive Dynamics; Business Analysis; Climate Change; Accounting; Finance; Valuation; Business and Shareholder Relations; Technological Innovation; Transition; Product Positioning; Renewable Energy; Analysis

August 2024
Background Note

Mitigating Climate Change with Machine Learning

By: Michael W. Toffel, Kelsey Carter, Amy Chambers, Avery Park and Susan Pinckney

This note highlights how machine learning is being used to decarbonize (reduce GHG emissions) several key sectors including electricity, transportation, building, industrial processes, and agriculture -- and how machine learning is being used to accelerate efforts to... View Details

Keywords: Climate; Artificial Intelligence; Adaptation; Climate Change; AI and Machine Learning; Innovation and Invention

March 21, 2022
Article

Are the Risks of Global Supply Chains Starting to Outweigh the Rewards?

By: Willy C. Shih

The conflict in Ukraine is only the latest jolt to global supply chains. Disruptions caused by the Covid-19 pandemic, climate-related events, and geopolitical tensions were already undermining their rationale. As companies rethink sourcing, they will have to consider... View Details

Keywords: Supply Chain Management; Supply Chain; Distribution; Globalization; Manufacturing Industry; Consumer Products Industry; United States; Asia; Europe

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February 2024
Supplement

ReNew (B): A New Direction

By: Gunnar Trumbull and Malini Sen

The global renewables sector was in a slump, but the Indian market was booming. India’s largest renewable electricity generator, ReNew, faced a dilemma: it traded on the Nasdaq in New York, but saw huge opportunity in the Indian market. In response, CEO Sumant Sinha... View Details

Keywords: Energy Generation; Renewable Energy; Entrepreneurship; Forecasting and Prediction; Trends; Transformation; Private Ownership; Environmental Sustainability; Mission and Purpose; Expansion; Market Entry and Exit; Energy Industry; Asia; India