- The idea that efforts to mitigate climate change expose fossil fuel assets to the risk of a bubble-like collapse has attracted some high-profile supporters.
- However, the notion of a "carbon bubble" depends on questionable assumptions concerning our current knowledge of climate change, the rate of adoption of renewable energy technology, and how such assets are valued.
In their recent Wall St. Journal op-ed
, Al Gore and one of his business partners characterized the current market for investments in oil, gas and coal as an asset bubble. They also offered investors some advice for quantifying and managing the risks associated with such a bubble. This is a timely topic, because I have been seeing references to this concept with increasing frequency in venues such as the Financial Times
, as well as in the growing literature around sustainability investing
Although bubbles are best seen in retrospect, investors should always be alert to the potential, particularly after our experience just a few years ago. In this case, however, I see good reasons to believe that the case for a “carbon asset bubble” has been overstated and applied too broadly. The following five myths represent particular vulnerabilities for this notion:
1. The Quantity of Carbon That Can Be Burned Is Known Precisely
Mr. Gore is careful to differentiate uncertainties from risks, which he distinguishes for their amenability to quantification. For quantifying the climate risk to carbon-heavy assets, he refers to the widely cited 2°C threshold for irreversible damage from climate change, and to the resulting “carbon budget
” determined by the International Energy Agency (IEA). As Mr. Gore interprets it, “at least two-thirds of fossil fuel reserves will not be monetized if we are to stay below 2° of warming.” That would have serious consequences for investors in oil, gas and coal.
The IEA’s calculation of a carbon budget depends on a factor called “climate sensitivity.” This figure estimates the total temperature change resulting from a doubling of atmospheric CO2 concentrations
. The discussion of climate sensitivity in the recently released Fifth Assessment Review
of the Intergovernmental Panel on Climate Change (IPCC) sheds more light on this parameter, which turns out not to be known with certainty. Their Summary for Policymakers
includes an expanded range of climate sensitivity estimates, compared to the IPCC’s 2007 assessment, of 1.5°-4.5°C with a likelihood defined as 66-100% probability
. It also states, “No best estimate for equilibrium climate sensitivity can now be given because of a lack of agreement on values across assessed lines of evidence and studies.”
The draft technical report that forms the basis for the Summary for Policy Makers provides more detail
on this. It further assesses a probability of 1% or less that the climate sensitivity could be less than 1°C. That shouldn’t be surprising, since temperatures have already apparently risen by 0.8°C above pre-industrial levels. At the same time, the report indicates that recent observations of the climate — as distinct from the output of complex climate models — are consistent with “the lower part of the likely range.”
In other words, while continued increases in atmospheric CO2 resulting from increasing emissions are widely expected to result in warmer temperatures in the future, the extent of the warming from a given increase in CO2 can’t be determined precisely before the fact. For now, at least, the CO2 level necessary to reach a 2°C increase would be consistent with calculated carbon budgets both larger and smaller than the IEA’s estimate. That means that the basis of Mr. Gore’s suggested “material-risk factor” — as distinct from an uncertainty — is itself uncertain.
2. The Transition to Low-Carbon Energy Is Occurring Fast Enough to Threaten Today’s Investments in Fossil Fuels
There is no doubt that renewable energy sources such as wind and solar power are growing at impressive rates. From 2010 though 2012
global solar installations grew by an average of 58% per year, while wind installations increased by 20% per year. Yet it’s also true that they make up a small fraction
of today’s energy production, and that the risks for investors of extrapolating high growth rates indefinitely proved to be very significant in the past.
For further clarity on this, consider the IEA’s latest World Energy Outlook
, the agency’s analysis of global energy trends, which was just released on November 12. The IEA projects global energy consumption to grow by 33% from 2011 to 2035 in its primary scenario, which reflects expanded environmental policies and incentives over those now in place. In that scenario, the global market share of fossil fuels is expected to fall from 82% to 76%, but with total fossil fuel consumption still growing by 24% over the period. Only in their “450″ scenario, based on similar assumptions to its carbon budget, would fossil fuel consumption fall by 2035, and then only by 11%.
Moreover, in its April 2013 report on “Tracking Clean Energy Progress
,” the IEA warned, “The drive to clean up the world’s energy system has stalled
.” This concern was based on their observation that from 1990 to 2010 the average carbon dioxide emitted to provide a given unit of energy in the global economy had “barely moved.” That’s hardly a finding to be celebrated, but it serves as an important reminder that while some renewable energy sources are growing rapidly, fossil fuel consumption is also growing, especially in the developing world — and from a much larger base.
The transition to lower-carbon energy sources is inevitable. However, it will take longer than many suppose, and it cannot be accomplished effectively with the technologies available today. That’s a view shared
by observers with better environmental credentials than mine.
3. All Fossil Fuels Are Equally Vulnerable to a Bubble
As Mr. Gore correctly notes, “Not all carbon-intensive assets are created equal.” Unfortunately, that’s a distinction that some other supporters of the carbon asset bubble meme don’t seem to make, particularly with regard to oil and natural gas. The vulnerability of an investment in fossil fuel reserves or hardware to competition from renewable energy and decarbonization doesn’t just depend on the carbon intensity of the fuel type — its emissions per equivalent barrel or BTU — but also on its functions and unique attributes.
The best example of this might be a recent transaction involving the sale of a leading coal company’s mines
. What’s behind this wasn’t just new EPA regulations
making it much harder to build new coal-fired power plants in the US, but some fundamental, structural challenges facing coal. Power generation now accounts for 93% of US coal consumption
, as non-power commercial and industrial demand has declined
. This leaves coal producers increasingly reliant on a utility market that has many other--and cleaner--options for generating electricity. That’s particularly true as the production of natural gas, with lower lifecycle greenhouse gas emissions
per Megawatt-hour of generation, ramps up, both domestically
. Coal accounts for about half
of the global fossil fuel reserves that Mr. Gore and others presume to be caught up in an asset bubble.
Compare that to oil, which at 29% of global fossil fuel reserves, adjusted for energy content, still has no full-scale, mass-market alternative in its primary market of transportation energy. Despite a decade-long expansion, biofuels account for just over 3%
of US liquid fuels consumption
, on an energy-equivalent basis. They’re also encountering significant logistical challenges
and concerns about the degree to which their production competes with food
. This has contributed to efforts in the EU to limit the share of crop-based biofuels to around 6% of transportation energy
. Biofuels have additional potential to displace petroleum use, particularly as technologies for converting cellulosic biomass become commercial, but barring a prompt technology breakthrough they appear incapable of substituting for more than a fraction of global oil demand in the next two decades.
Electric vehicles offer more oil-substitution potential in the long run, though they are growing from an even smaller base than wind and solar energy. Their growth will also impose new burdens on the power grid and expand the challenge of displacing the highest-emitting electricity generation with low-carbon sources.
Meanwhile, natural gas, at 20% of global fossil fuel reserves, offers the largest-scale, economic-without-subsidies substitute for either coal or oil. In any case, it has the lowest priority for substitution by renewables on an emissions basis, and so should be least susceptible to a notional carbon bubble.
4. A Large Change in Future Fossil Fuel Demand Would Have a Large Impact on Share Prices
Although Mr. Gore’s article includes a good deal of investor-savvy terminology, it is entirely lacking in two of the most important factors in the valuation of any company engaged in discovering and producing hydrocarbons: discounted cash flow (DCF) and production decline rates. Unlike tech companies such as Facebook or even Tesla, the primary investor value proposition for which depends on rapid growth and far-future profitability, most oil and gas companies are typically valued based on risked DCF models in which near-term production and profits count much more than distant ones.
At a conservative discount rate of 5%, the unrisked cash flow from ten years hence counts only 61% as much as next year’s, while cash flow 20 years hence counts only 38% as much. Announced changes in near-term cash flow due to unexpected fluctuations in production or margins would normally be expected to have a much bigger impact on share prices than an uncertain change in demand a decade or more in the future.
This is compounded by the decline curves typical of many large hydrocarbon projects. If the first 3-5 years of a project account for more than half its undiscounted cash flows, it won’t be very sensitive to long-term uncertainties, nor would a company made up of the aggregation of many projects with this characteristic. This is even truer of shale gas and tight oil projects, which yield faster returns and decline more rapidly.
I can’t speak for Wall Street's oil and gas analysts, but I’d be surprised based on past experience in the industry if the risk of a 10% or greater drop in global demand for oil or gas in the 2030s would have much of an effect on their price targets for companies — certainly not enough to qualify as a bubble.
5. Fossil Fuel Share Prices Don’t Already Account for Climate Risks
The assertion of a carbon bubble in fossil fuel assets ultimately depends on investor ignorance of climate-response risks, presumably because companies haven’t quantified those risks for them. To the extent the latter condition is true, it represents an opportunity for companies seeking to capitalize on the boom in sustainability-based investing.
However, you needn’t be an adherent of the Efficient Markets Hypothesis for which Eugene Fama was named as a recipient of this year’s Nobel Prize in Economics
to realize that thanks to the Internet, average investors have access to most of the same information on this subject as Mr. Gore and his partners. Institutional investors, who make up the bulk of the shareholding for at least the larger energy firms, and the analysts who follow these companies have the resources to access even more information.
Nor is the idea of a carbon bubble exactly new. Mr. Gore didn't create it
, and I’ve been following it for a couple of years, as it took over from waning interest in Peak Oil. It’s not an obscure risk, either, in the sense that sub-prime mortgages and credit default swaps were in the lead-up to the failure of Lehman Brothers in 2008. It’s becoming more mainstream every day, although the burden of proof that this risk is mispriced rests with those advocating this view.
Before concluding, a word of disclosure is in order. As you may gather from my bio, I spent many years working with and around fossil fuels, though my ongoing involvement in energy is much broader than that. As a result of that experience, my portfolio includes investments in companies with significant fossil fuel holdings. I strive for objectivity, but I can’t claim to be disinterested. However, neither can Mr. Gore. As a major investor in renewable energy and other technologies through the firm
cited in the article and other roles
, he has as much at stake in promoting the idea of a carbon bubble — and on a very different scale — as I might have in dispelling it.
The carbon bubble is an interesting hypothesis, even if I don’t yet find the arguments made in support of it convincing. Despite that, I see nothing wrong with investors wanting to track their carbon exposure, consider shadow carbon prices, or ensure they are properly diversified. However, the biggest risk I see that might eventually warrant considering divestment of fossil-fuel-related assets isn’t based on the merits of this analysis, but on the possibility of creating a self-fulfilling prophesy by means of drumming up social pressure on institutional investors. You might very well think that applies to this Wall St. Journal op-ed. I couldn’t possibly comment.
A different version of this posting was previously published on Energy Trends Insider.