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Global carbon surcharge for the reduction of anthropogenic emission of carbon dioxide
Energy, Sustainability and Society volume 10, Article number: 9 (2020)
Abstract
Background
Many governments take the view that voluntary national targets to reduce greenhouse gas emissions are sufficient to avoid negative climate effects. In the absence of independent verification, however, pledges are unlikely to be sufficient for a rapid and strong reduction of emissions. It is often claimed that a global carbon tax could be an effective instrument. However, such a tax is difficult to set and to collect, especially in countries with poor administrative infrastructure.
Results
Here, we formulate and discuss a novel approach, the Global Carbon Surcharge (GCS), that mimics a carbon tax but does not require tax collection by governments. We define GCS as a requirement or a voluntary commitment encompassing all companies extracting carbon-carrying raw materials, namely coal, oil, gas and limestone, with the aim to burden their extraction with costs proportional to their carbon intensity. GCS mandates all companies to store these materials immediately after mining for a given period of time in the vicinity of the production site. Thereby, GCS generates additional costs that propagate through all sectors of the global economy. We elucidate how the investment costs for the storage infrastructure translate into surcharges on the raw materials.
Conclusions
We show that by a proper choice of the storage time and the size of the storage unit, GCS becomes equivalent to a carbon tax in the range between 50 and 100 € per ton of CO2 that is assumed to be necessary for the transition to a carbon-neutral energy system. An attractive feature of GCS is that it can be verified, in particular by citizens themselves, using publicly available satellite data. Finally, if compulsory storage is coupled to blockchain-based smart contracts and a mandatory (expensive) mining of cryptocurrency, GCS can be operated without governmental protectionism, corruption and fraud. However, the main uncertainties of the GCS approach lie in the substantial expansion of infrastructure and the fact that the induced price effects must be sufficient to achieve a rapid and far-reaching substitution of fossil fuels.
Background
Mitigating climate change is a grand challenge of the twenty-first century [1,2,3,4,5,6,7]. The current approach to accomplish this task is embodied in the Paris Agreement [1] under which each country sets voluntary national targets for the reduction of the emissions of CO2 and other greenhouse gases (GHG). However, such agreements alone have drawbacks. If there are no financial penalties against countries who fail to meet their targets, the implemented agreements can be ineffective. Furthermore, governments can withdraw from the Paris Agreement, as the announcement by the US administration [8, 9] has shown. Finally, there is no explicit incentive for governments to meet the targets in a cost-efficient way.
Market-based instruments such as carbon trading schemes and carbon taxes [3, 10, 11] promote an efficient allocation of resources and lead to economic incentives for decarbonization. However, carbon trading does not necessarily cover all sectors and requires extensive administrative efforts for small and decentralized sources of GHG emissions. Carbon taxes do not necessarily cover all sectors either. Moreover, they are difficult to collect in countries with weak governance, and the use of the tax income in such countries is not necessarily to the benefit of the people.
Current approaches, in which international climate agreements are essentially voluntary, have little prospect of slowing climate change if freeriding is widespread. To avoid free riders that occur when a party receives the benefits of a public good without sharing the costs, other researchers have already developed polycentric CO2 surcharge systems that do not rely on international global agreements that need to be transposed into national law.
Spreng et al. [12] propose a new type of climate insurance for CO2. In this system, fossil fuels can be ‘insured’. A label would then indicate whether products were produced with energy from insured fossil fuels or not. The premiums collected from this ‘risk pool’ would be used to adapt to climate change and to compensate for certain damages; in return, the producers of the insured fossil fuels would be protected against claims of liability for climate damage. Consumers could decide whether they prefer labelled or unlabelled products. Similarly, Nordhaus [13] argues for a so-called climate club, a new type of free-trade zone. Participating governments would be incentivized to pursue a strong climate policy as this would not lead to exclusion from the free-trade zone. Modelling results suggest that small trade penalties for non-participants can lead to more climate cooperation. However, it is difficult for such and other approaches to prove their effectiveness.
To overcome the drawbacks of existing schemes for the reduction of CO2 emissions, we formulate a conceptually simple economic model, the Global Carbon Surcharge (GCS), that increases the costs of carbon-carrying materials at the earliest possible stage of the value chain. It thereby creates economic incentives to decarbonize the energy systems and minimizes administrative efforts. In the present work, we investigate GCS as an exemplary thought experiment, without being able to go into the details of its practical implementation in a comprehensive manner. In particular, we are aware that the sole purpose of our concept is raising the cost of CO2 emissions and that it is therefore unlikely to be realized in its proposed form.
Approach
The majority of anthropogenic CO2 emission is due to the combustion of coal, oil and gas, and to a smaller extent due to the use of limestone (calcium carbonate, CaCO3) for the production of cement [14]. If a mechanism could render the extraction of these materials increasingly difficult, the prices for these four commodities would increase. Such economic signal would propagate through the global value chain and provide strong incentives for a decarbonization of the energy system.
We stipulate that the commodity x (where x stands for gas, oil, coal or limestone) is stored for a given period of time, denoted nx [years], in the vicinity of the mining site, before it is released into the market. We further assume that the investment costs for the storage infrastructure are equal to cx [in € per ton of storage capacity], the lifetime of the infrastructure is n [years] and the interest rate is i [percent], and that the operating costs for the infrastructure are negligible in comparison with the investment costs.
As detailed in the ‘Methods: model and data’ section, we compute the surcharge csx [in € per ton of CO2] that has to be added to the cost of each of the four materials in order to compensate for the depreciation of the storage infrastructure. This quantity shall be referred to as the Global Carbon Surcharge. We are particularly interested in the question under which conditions the GCS is equal to 75 €/t [€ per ton of CO2] assumed here to be a plausible benchmark of effectiveness in the wide range of estimates of social costs of CO2 emission [15, 16]. In order to show the sensitivity of the results, we distinguish between more expensive small-scale and lower-cost large-scale options and vary interest rate, storage time and lifetime of the storage infrastructure.
It should be made clear from the outset that the sole purpose of this measure is to make CO2 emissions more expensive without any other benefit. This distinguishes the present thought experiment from other concepts like the carbon tax.
Methods: model and data
Model
Our model for the carbon surcharge csx rests on the following assumptions: (1) A source of a carbon-carrying raw material x (coal, oil, gas, limestone) delivers a mass mx [tons] per year. After combustion of gas, oil and coal or after calcination of limestone, a mass of m [tons] CO2 is generated from each ton of raw material. For the present computation, we do not need the masses mx and m but only the carbon ratio αx = m/mx. This parameter expresses how many tons of CO2 are generated from each ton of carbon-carrying material. (2) The raw materials are stored in a storage infrastructure with specific investment costs cx [Euro per ton], lifetime n [years] and interest rate i [percent] whose operating costs are negligible in comparison with the investment costs. (3) A mandatory storage time nx [years] is assumed over which the raw material x has to be kept in the storage infrastructure before it may be released for sale.
Under the given assumptions, the total capital cost of the storage infrastructure (per ton of storage capacity) can be calculated as cxan,i, where the annuity an,i is given by the equation
The depreciation of the infrastructure appears as a surcharge to each ton of material for each storage cycle. The total number of storage cycles over the lifetime of the infrastructure is n/(tx/365) or n/nx. Taking into account that one ton of material x is converted into αx tons of CO2, the desired result for the carbon surcharge is
This quantity is equivalent to the effective carbon surcharge in € per ton of CO2 that would be induced by the proposed mechanism.
General input data
For our calculations, we use the following general input data: αgas = 2.98, αoil = 3.21, αcoal = 2.5, αlimestone = 0.44 (according to [17]), an assumed lifetime of the storage infrastructure of n = 10 years and interest rates equal to i = 0%, 5% and 10%.
Data for large-scale storage infrastructure
Natural large-scale storage solutions include all options where natural materials are used to confine the mined material. We use the following estimates for the specific investment costs cx based on expert judgments, available analyses (e.g., [18, 19]) and own assumptions:
○ Open-pit coal or limestone storage: cc = 1 €/t
○ Underground oil storage: co = 1.1 €/t
○ Underground gas storage salt cavern: cg = 5 €/t to 35 €/t
○ Underground gas storage depleted gas reservoir: cg = 1 €/t to 18 €/t
Artificial large-scale storage solutions include all options where the storage vessels are made of artificial materials. Our estimations are based on various industry expert interviews, business information (e.g., [20,21,22]) and own assumptions and amount to:
○ Enclosed coal and limestone bunkers: cc = 200 €/t
○ Oil storage tanks (steel tanks): co = 300 €/t
○ Gas tank farms (pipe container, 70 bar): cg = 550 €/t
Data for small-scale storage infrastructure
The investment costs consist of investment in the wagon (approximately 100,000 €, estimation based on information from German manufacturers [23,24,25]), in the tracks (around 10,000 € per 10 m trackage derived from historic cost data for light railways) and the cost of steel containers that depends on the good (again average estimations derived from manufacturer’s information [26, 27] and own assumptions):
○ Silo for pulverized coal and limestone: cc = 2200 €/t
○ Oil tank: co = 1900 €/t
○ Gas tank (CNG, 200 bar): cg = 8900 €/t
Sensitivity tests were carried out with regard to storage time and lifetime of the storage infrastructure. The results of these calculations in terms of effective GCS are plotted in Figs. 1 and 2.
Assessment of resource intensity
As a benchmark, the resource intensities of the two most important materials of the built environment—concrete and steel—which would be needed to build the physical storage infrastructure are taken as an estimate for the additional emissions generated by GCS. As these materials carry embodied emissions, their usage by GCS would be the source of additional global warming. To reach a target surcharge cs, certain investments in materials have to be undertaken. As an upper estimate, we assume that the world market cost of concrete and steel would be the basis of the expenditures necessary to raise the effective carbon price. As cost values, we assume:
○ Steel: cs = 500 €/t
○ Concrete: cco = 43.5 €/t
From the ecoinvent database [28], we take global warming potentials (including pre-chain emissions) per ton of material GWPx, with the following values:
○ Steel: GWPs = 2.172 tCO2eq/t
○ Concrete: GWPco = 0.099 tCO2eq/t
The additional emissions e can thus simply be derived from the targeted surcharge, the specific expenditure per ton of material x and the specific impact as:
In addition, the following specifications were assumed for the estimation of material requirements and land use of standard goods wagons according to [23]: Oil and gas: 95 m3 volume, ~ 16 m length, 17.6 t dead weight. Solid materials: 82 m3 volume, ~ 16 m length, 18.3 t dead weight.
Results
We first analyse the results for large-scale storage, which we classify into natural and artificial. Natural large-scale storage includes all options where natural boundaries confine the mined material, whereas artificial storage refers to engineering constructions. With the estimates ccoal ≈ climestone ≈ 1 €/t for open pit storage, coil = 1.1 €/t for underground oil storage in salt caverns, 10 €/t < cgas < 35 €/t for underground gas storage in salt caverns and 5 €/t < cgas < 18 €/t for underground gas storage in depleted gas reservoirs, we arrive at surcharges (per ton of CO2) in the range between csx = 0.1 €/t and csx = 2 €/t. This is significantly smaller than the mentioned benchmark. It should also be noted that, for reasons of energy security, large-scale oil storage infrastructures have already been built in recent decades with low price effects.
Figure 3 (left) shows the carbon surcharge for artificial large-scale storage. In order to take into account future economic uncertainties, we plot the GCS for interest rates ranging from i = 0% to i = 10%. The figure demonstrates that the carbon surcharge is a linearly increasing function of the storage time whose slope is inversely proportional to the carbon ratio αx defined in the ‘Methods: model and data’ section. Since αlimestone is significantly lower than that of the other materials, the carbon surcharge for limestone has a higher slope and is therefore better suited for GCS. Nevertheless, Fig. 3 (left) shows that all surcharges, except for limestone at high interest rate, remain below 75 €/t as long as the storage time is less than 2 years. Although we have neglected operating costs, which may generate higher values of the surcharge, we conclude that artificial large-scale storage is unlikely to be a feasible basis for GCS.
We next analyse a modified concept, referred to as small-scale storage. Here, we assume that the flow of all four carbon-carrying raw materials is discretized into standardized small portions that are easy to track. More specifically, we assume that after mining, the materials are filled into standard intermodal containers which are mounted on railway cars. As shown in the conceptual view in Fig. 4, the cars can be driven to the storage site and kept there for the required time. If the upper sides of the containers are equipped with a digital identifier in the form of a barcode or a QR code, the identity and position of the car can be tracked from space (see e.g., [29]) or by future high-altitude platforms [30]. The computed surcharge for small-scale storage is shown in Fig. 3 (right). The figure reveals that the higher investment costs for railway cars and containers as compared to the large-scale storage options translate directly into a higher slope of csx versus storage time. This implies that small-scale storage is suited to provide a surcharge in the range of 75 €/t.
Table 1 gives an overview of csx for both large-scale and small-scale storage options. For a storage time of 1 year, all small-scale storage options lead to a surcharge that is higher than 75 €/t. This indicates that small storage units and long storage times are the key to high values of csx. The last column of Table 1 shows the storage time necessary to obtain csx = 75 €/t. The figures indicate that for the small-scale storage case, the required storage time is less than 1 year for all materials considered.
Discussion
We now briefly discuss the limitations of the presented model as well as the advantages and disadvantages of GCS over traditional methods for climate change mitigation.
As GCS is a conceptual thought experiment, its realization is elaborated only theoretically. In order to keep our model simple, we have neglected two aspects. First, we have confined our attention to the direct investment costs for the storage infrastructure because they can be described by a simple universal scaling law. We have neglected indirect investment costs (e.g., measures necessary for compliance with environmental regulations or other legislation) as well as operating costs. We have also ignored the risks of cost overruns [31] that are characteristic of large-scale construction projects. Taking into account these costs would increase csx significantly. Second, we assumed in our model that the lifetime n and the storage time nx are given parameters. As a consequence, the surcharge would drop after n years because the investment costs have been recovered, but further costs may arise from maintenance and replacement after the lifetime of the storage facility. In the event that the storages are provided by leasing companies, additional costs may be incurred for logistics services. If GCS were to be implemented globally, nx would have to be increased continuously so as to enforce a continuous expansion of the storage capacity and to make csx a monotonically increasing function of time. Moreover, the parameters nx would have to be set in such a way that the surcharge per ton of CO2 is identical for all four materials.
Potential advantages of GCS are its impact across all economic sectors, no need for tax collection, the absence of tax revenues in countries with weak governance, the opportunity to publicly trace and verify the carbon storage using remote sensing and the possibility to organize GCS as a global agreement between citizens and firms with little or no governmental involvement.
Potential disadvantages of GCS are the high financial and resource expenditures for the theoretically drafted storage infrastructure, the non-uniformity of the storage cost due to differences in the material and labour cost between different countries, possible ecological damage, safety risks and land use, and large revenues for certain sectors like the construction and steel industries. The embodied emissions of the materials of the storage infrastructure (mainly steel and concrete) would be an additional source of GHG emission. We estimate that the expenditure on steel and concrete necessary to raise the effective carbon price would at maximum generate additional emissions between 0.14 and 0.31 t of CO2-equivalent per ton of priced carbon for a surcharge of 75 €/t, which would conversely reduce the available budget of remaining emissions. The use of infrastructure would be considerable in the case of small-scale storage. If we assume standard goods wagons more than 150 million units would be required to store the four considered commodities according to the assumed required storage time nx shown in Table 1. The material requirements for the goods wagons are estimated at more than 2.7 billion metric tons (mainly steel, i.e. 1.7 times annual world steel production) and the land use at about 6500 km2, which is about 1% of the size of France. Assuming today’s specific emissions of 1.83 t of CO2 per ton of steel [32], the GCS approach would, in the worst-case scenario, cause an additional output from steel production equivalent to 12–15% of today’s global CO2 emissions.
Finally, we wish to discuss our concept from a broader perspective. The artistic view expressed in Fig. 4 must not be taken literally. Nevertheless, it illustrates three key properties of GCS, namely the discretization of the global carbon stream into small parcels, the traceability of each individual parcel, e.g. from space, and the possibility to apply a controlled resistance to the mining of carbon-carrying materials.
We shall now explain how these features can be enhanced and improved by cryptographic tools. We have already pointed out that each container could be equipped with a QR code that allows satellites to trace them from space. In order to avoid any residual possibility of fraud, each container of coal could be additionally registered in a blockchain [4, 33]. The data in the blockchain can be accessed by anyone through the Internet, and hence, each container can be traced by the general public from the instant of mining to its injection into the coal market. Blockchain technology could also be used to connect mining information to sensors embedded in the railway cars and in the mined materials, thereby improving traceability. Thus, digitalization and blockchain would transform the anthropogenic carbon cycle from an anarchic system into a transparent and well-documented one.
We finally demonstrate how the physical ‘resistance’ to the mining of carbon-carrying materials embodied in the vast array of railway cars can be enhanced by a virtual resistance. This can be accomplished by coupling the mining of coal, oil, gas and limestone to the creation of cryptocurrency. The generation of fresh cryptocurrency [34] is a computationally expensive process which is referred to as mining in the same way as this term is applied to raw materials. Cryptocurrencies can be designed in such a way that the number of cryptocoins is limited and the computational cost (expressed by the number of binary operations) for each coin increases in a predefined way as the maximum number of coins is approached. Since the computational cost of mining cryptocurrency is directly connected to the cost of computers and electricity, the mining process is equivalent to a financial penalty if coupled to the mining of raw materials.
Assuming that we introduce a new cryptocurrency, tentatively called ‘Carboncoin’, we could use it to increase the cost of GCS as follows. We require that the mining of each unit of coal, oil, gas and limestone must be accompanied by the mining of one Carboncoin. The exact amount of Carboncoins per ton of raw material could be defined in such a way that one Carboncoin corresponds to the amount of raw material that would emit 1 t of CO2 after combustion. We now assume that the Carboncoin-currency is designed in such a way that its number is limited.
It was reported recently [7, 35] that humanity is left with approximately 600 billion tons of CO2 to emit if global warming is to be kept below 2 °C. Coupling the mining of raw material to a mandatory mining of Carboncoins would tie the remaining emissions of CO2 to the Carboncoins whose number is limited to a maximum of 600 billion units by the design of a mining algorithm. Under such a scheme, our carbon credit would be automatically limited by the laws of cryptography. The finite amount of cryptocurrency and the high computational power necessary for its mining would increase the GCS far beyond the values listed in Table 1. It is important to note that the current cryptocurrency mining method (‘Proof of Work’) is criticized for its extensive energy consumption and carbon footprint, see e.g. [36]. However, blockchains do not necessarily need to be based on this algorithm. Less energy-consuming consensus algorithms, such as ‘Proof of Stake’, could potentially avert an ever-increasing energy demand.
To set the speed of the decarbonization of the global energy system, the mining algorithm for Carboncoins would have to be designed in such a way that the computational cost increases with time so as to limit the anthropogenic emission or carbon dioxide according to the requirements of the corresponding decarbonization scenario. This parameter would have to be set by international agreements.
It should be noted that our concept of Carboncoins is fundamentally different from that of the Climatecoins recently proposed for emission trading. Our Carboncoin serves no other purpose than to provide a reliable evidence of the extraction of a limited amount of carbon-carrying material. It should also be emphasized that this concept is easier to verify than climate compensation measures.
Finally, we should discuss some fundamental uncertainties in the implementation of the GCS approach. On the one hand, this concerns the role of producers, who will have to lose most of their business volume in the long term as a consequence of climate targets. GCS could provide financial incentives for producers to adapt and pivot their business cases with the retention of fuels and by participating in the emerging infrastructure business. Given the remaining 600 billion tons of CO2 to emit and a targeted GCS of at least 75 €/tCO2, an annual financial volume on the order of 1500 billion € can be anticipated on average for the period up to 2050. At the same time, there must also be mechanisms that ensure that a high enough effective carbon price is reached quickly to not exceed the carbon budget, especially at the beginning of the introduction of GCS. This seems necessary because the price elasticity of fossil resource use is unclear in view of existing path dependencies, and the instrument must not lead to a further delay in stringent and effective climate protection. With increasing costs for fossil resources, possibilities will be sought to circumvent the regulations. Therefore, a superior independent organization would have to evaluate and monitor the mechanisms and their effectiveness.
Conclusions
Our analysis shows that a mandatory on-site storage of carbon-carrying raw materials could in principle achieve a high cost effect, even if there are many question marks about economic and ecological impacts and the concrete feasibility. Such a mechanism therefore has the potential to add an effective surcharge on all subsequent products, covering all sectors of the world economy. Thus, it can increase the effective price of carbon in a similar way as a global carbon tax. However, it encloses the opportunity to trace and verify the cost drivers and the possibility to be organized as a global agreement between citizens and firms. The calculations reveal that only small-scale storage with large material and infrastructural needs is suited to provide a surcharge in the range of 75 €/t that is believed to be necessary for effective decarbonization. Compulsory storage can in principle be coupled with blockchain-based smart contracts and a mandatory mining of cryptocurrency.
We have introduced GCS as an exemplary thought experiment focusing on how far investment costs translate into surcharges on the raw materials. Aspects of a practical implementation, verification of effectiveness and economic and ecological implications need further analysis but are beyond the scope of the present paper.
Availability of data and materials
All data used and generated during this study are cited respectively and are included in this published article. The detailed dataset calculated and used for the presentation of the results is available from the corresponding author on reasonable request.
Abbreviations
- CaCO3 :
-
Calcium carbonate
- CNG:
-
Compressed natural gas
- CO2 :
-
Carbon dioxide
- GCS:
-
Global carbon surcharge
- GHG:
-
Greenhouse gases
- GWP:
-
Global warming potential
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Acknowledgements
The authors are grateful to Richard Bamler and Stefan Dech for insightful discussions about satellite imaging.
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AT conceived the concept and formulated the model. MK, KN and TP collected the data and carried out the computations. All authors discussed the results. AT wrote the paper, and all coauthors commented the manuscript. All authors read and approved the final manuscript.
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Thess, A., Klein, M., Nienhaus, K. et al. Global carbon surcharge for the reduction of anthropogenic emission of carbon dioxide. Energ Sustain Soc 10, 9 (2020). https://doi.org/10.1186/s13705-020-0242-z
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DOI: https://doi.org/10.1186/s13705-020-0242-z