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The carbon bubble: Rethinking fossil fuel investments

An engineer wearing a white helmet and orange safety vest uses a laptop while observing an industrial plant with tall structures and chimneys at sunset.
Published 7 Jan 2026

By Paul Moody

As we navigate the complexities of sustainable investing, it's crucial to stay informed about the evolving landscape of energy markets and their impact on investment strategies. In a recent episode of The Sustainability Story podcast, I had the privilege of speaking with Mark Campanale, founder of the Carbon Tracker Initiative, about the concept of the 'carbon bubble' and its implications for the future of fossil fuels.

Mark's insights shed light on a critical issue facing investors today: the potential overvaluation of fossil fuel assets in a world transitioning towards cleaner energy sources. This conversation underscored the importance of understanding climate-related financial risks and opportunities in our rapidly changing global economy.

The carbon bubble explained

The 'carbon bubble' refers to the potential overvaluation of fossil fuel companies based on the assumption that all of their reserves will be extracted and burned. However, as Mark pointed out, if we are to meet global climate targets, a significant portion of these reserves must remain untapped. This creates a disconnect between the market valuation of these companies and the reality of a carbon-constrained future.

Investment professionals may wish to consider the implications of this 'unburnable carbon' on long-term portfolio performance. The risk of stranded assets – fossil fuel reserves that may become economically unviable due to climate policies or market shifts – is a growing concern that demands our attention.

Shifting investment landscape

Mark's work with the Carbon Tracker Initiative has been instrumental in bringing these issues to the forefront of financial analysis. Their research suggests that the traditional energy sector may be facing significant challenges in the coming years, as renewable energy sources become increasingly competitive and climate regulations tighten.

This shift presents both risks and opportunities for investors. While some fossil fuel investments may become less attractive, the transition to a low-carbon economy is opening up new avenues for growth in sectors such as renewable energy, energy efficiency, and clean technology.

The role of investors in the energy transition

As Mark makes clear, as stewards of capital, there is a responsibility to consider these long-term trends and their potential impact on investment returns. He emphasizes the power of investor engagement in driving corporate behavior towards more sustainable practices. By asking the right questions and demanding greater transparency around climate risks, investors can play a crucial role in accelerating the energy transition.

It's important to note that this isn't about advocating for or against particular investments. Rather, it's about ensuring that investment professionals possess the tools and knowledge to accurately assess climate-related risks and opportunities in our portfolios.

Implications for professional development

The conversation with Mark reinforced the importance of continuous learning and upskilling in our rapidly evolving field. As the investment landscape shifts in response to climate change and energy transition, it's crucial that we stay informed about these developments and their potential impact on financial markets.

At CFA Institute, we're committed to providing the education and resources needed to navigate these complex issues. Our Sustainable Investing Certificate, for instance, offers a comprehensive grounding in the analysis of environmental, social, and governance factors – including ESG-related risks and opportunities.

Looking ahead

The concept of the carbon bubble challenges us to think critically about long-held assumptions in the energy sector. It underscores the need for robust scenario analysis and forward-looking risk assessment in our investment processes.

As we move forward, it's clear that understanding the complexities of the energy transition will be crucial for investment professionals. Whether we're analyzing individual companies, constructing portfolios, or advising clients, the ability to integrate climate considerations into our financial analysis will be an increasingly valuable skill.

Mark’s insights serve as a timely reminder of the dynamic nature of our discipline. As investment professionals, we must remain adaptable, continuously expanding our knowledge and skills to meet the challenges of a changing world. By doing so, we can better serve our clients, contribute to the resilience of our financial systems, and play a positive role in the transition to a more sustainable global economy.

The conversation with Mark was both enlightening and thought-provoking, and I encourage you all to engage with these important topics. After all, it is through open dialogue, continuous learning, and thoughtful analysis that we can best navigate the complexities of sustainable investing and contribute to a more resilient financial future.

Author

Paul Moody
Managing Director, Global Partnerships & Client Solutions
Paul Moody directs the organization’s regional, marketing and customer experience strategy, and leads the teams who work with the 160 local CFA societies around the world. His priorities include deepening our society and institutional relationships, accelerating our B2B and B2C sales and distribution capabilities, bringing new professional educational products to market, and driving revenue growth across our product portfolio.

Prior to joining CFA Institute, Mr. Moody enjoyed a 30-year career in asset management, including more than 20 years at Aviva Investors leading strategic partnerships, business strategy, and execution of the Client Solutions business plan. He embedded environmental, social, and governance (ESG) factors into client solutions — in particular, a climate transition suite of funds across liquid and illiquid assets and smart beta ESG/climate enhanced solutions. Prior to Aviva Investors, Mr. Moody worked at Henderson Global Investors Limited, NPI, and National Westminster Bank. He holds a bachelor’s degree in economics from the University of Wolverhampton and is a Chartered Alternative Investment Analyst (CAIA).

He is based in the London, UK office.
Paul Moody

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