Greta Jimenez
Marginal abatement cost is an economic concept that measures the cost of reducing one additional unit of pollution. It is the cost associated with eliminating one unit of pollution or the marginal loss in company profits from avoiding the last unit of pollution. Marginal abatement costs are typically represented on a marginal abatement cost curve, which shows the marginal cost of additional reductions in pollution. These curves are used by economists, policy-makers, and carbon traders to make decisions about long-term capital investment strategies, interregional carbon trading, and carbon price fundamentals. However, the construction of these curves has been criticized for its lack of transparency and poor treatment of uncertainty, inter-temporal dynamics, and interactions between sectors. While marginal abatement costs can be negative, they often rise steeply as pollution reduction becomes more aggressive. As a result, it becomes more expensive to reduce pollution past a certain point, and the total abatement cost increases.
| Characteristics | Values |
|---|---|
| Definition | Marginal abatement cost is the cost of reducing one more unit of pollution. |
| Synonyms | Marginal cost of reducing environmental negatives, marginal loss in company profits from avoiding the last unit of pollution |
| Calculation | Marginal abatement cost = cost of eliminating one unit of pollution |
| Factors affecting economics of pollution | Marginal cost, marginal benefit, marginal damage |
| Marginal benefit | Increase in satisfaction received from a unit increase |
| Optimum amount of pollution | When marginal benefit equals marginal cost of pollution |
| Marginal damage | Damage function D(E) depends on aggregate emissions and is increasing |
| Optimal level of total emissions | Marginal abatement costs should be equal to marginal damage |
| Optimal quantity of pollution | Determined by straightforward maximization problem |
| Weitzman's framework | C (a, ε) = firm’s cost of abatement, where e is a parameter known to the firm but not the regulator |
| Use cases | Used by carbon traders, power companies, economists, policy-makers, government, corporations |
| Concerns | Lack of transparency, poor treatment of uncertainty, inter-temporal dynamics, biased ranking |
| Examples | Improving energy efficiency of buildings, replacing fossil-fuelled power plants with renewables, improving petrol cars, installing smokestack scrubbers |
| Country-specific examples | Germany, US, Mexico, China |
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What You'll Learn
Marginal abatement cost curves
Marginal abatement cost (MAC) curves are a popular policy tool that helps identify GHG emissions abatement potential and related abatement costs. MAC curves are used for various environmental issues across different countries and are increasingly applied to government climate change policies and corporate climate strategies.
A marginal abatement cost curve – or MACC – is simple to understand. In this context, ‘abatement’ means ‘reducing’. A MACC presents the costs or savings expected from different opportunities, alongside the potential volume of emissions that could be reduced if implemented. MACCs measure and compare the financial cost and abatement benefit of individual actions. They use the metric of dollars per tonne of carbon dioxide equivalent – usually represented as $/tCO2e. Each different opportunity is an action, presented as a box above or below a horizontal axis. Boxes above the axis indicate a cost to that action – the higher the box, the higher the cost. Boxes below the axis indicate a saving from that action – the lower the box, the greater the saving.
The marginal abatement cost curve approach has been criticised for a lack of transparency and poor treatment of uncertainty, inter-temporal dynamics, interactions between sectors, and ancillary benefits. There is also concern regarding the biased ranking that occurs if some included options have negative costs. Marginal abatement cost studies show that improving the energy efficiency of buildings and replacing fossil-fuelled power plants with renewables are usually the most cost-effective ways of reducing carbon emissions.
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Negative abatement costs
For example, road transport offers a good illustration of negative abatement costs. Marginally improving petrol cars to reduce their emissions is inexpensive, and the cost per tonne of avoided emissions is low. However, improving combustion engines does not contribute to the decarbonisation of transport, as these engines will always emit carbon dioxide. Instead, a more radical shift is needed, such as promoting public transportation, non-motorised transport, and the electrification of cars and trucks. While the abatement cost of this strategy may be higher initially, it accelerates progress towards carbon neutrality and ensures a lower total abatement cost.
Another example is the heat pump, which is more energy-efficient than traditional alternatives. Replacing a gas boiler with a heat pump reduces greenhouse gas emissions, but there is an installation cost and an ongoing electricity cost. However, the user saves money by no longer purchasing gas, resulting in a net economic gain.
While negative abatement costs offer attractive opportunities, it is important to recognise that marginal abatement costs tend to increase steeply as pollution reduction becomes more aggressive. This is because achieving near-zero emissions requires transformative changes in production modes, and the focus shifts from identifying low-cost opportunities to avoiding all emissions at the lowest possible cost.
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The economics of pollution
Economics plays a crucial role in addressing pollution, as the costs of reducing and eliminating pollution are significant factors in decision-making for both the public and private sectors. The marginal cost of pollution abatement, a key concept in this field, refers to the additional cost incurred to reduce or eliminate one more unit of pollution. This concept is often depicted using marginal abatement cost curves, which illustrate the relationship between the cost of reducing pollution and the amount of pollution reduced.
Marginal abatement cost curves are used by economists, policymakers, and companies to guide decisions and develop strategies. For instance, power companies may use these curves to inform long-term capital investment strategies, while policymakers may use them to analyze the potential for emission reductions and direct policies accordingly. However, these curves have limitations and should not be solely relied upon for implementing emission-reduction measures, as they may not capture the complexity and dynamics of the issue.
In conclusion, the economics of pollution revolves around the concept of marginal abatement cost and its application in decision-making. While it is a valuable tool, it is essential to recognize its limitations and complement it with other approaches to effectively address the complex and pressing issue of pollution.
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Carbon neutrality
The marginal cost of pollution abatement is an economic concept that measures the cost of reducing one additional unit of pollution. Marginal abatement costs are also referred to as the "marginal cost" of reducing environmental harm. These costs can sometimes be negative, such as when a low-carbon option is cheaper than the status quo. However, marginal abatement costs tend to increase sharply as pollution reduction approaches zero, as it becomes more expensive to implement the necessary technological and infrastructure changes.
Now, carbon neutrality, or carbon neutral, was the New Oxford American Dictionary's word of the year in 2006 and has since become a mainstream term. It refers to the balance between emitting carbon and absorbing carbon emissions from carbon sinks, or eliminating all carbon emissions. Carbon sinks, such as forests, soils, and oceans, absorb more carbon than they emit.
To achieve carbon neutrality, companies can either drastically reduce their carbon emissions to net zero or balance their emissions through offsetting and the purchase of carbon credits. Offsetting carbon emissions involves investing in renewable energy, energy efficiency, or other clean, low-carbon technologies. Carbon credits can be used to fund carbon removal projects, such as reforestation, or initiatives that aim to avoid emissions, such as energy efficiency retrofits.
While carbon neutrality focuses specifically on carbon dioxide emissions, net zero includes all greenhouse gas emissions. Net zero is a longer-term target that requires more stringent standards, while carbon neutrality is a more short-term goal with higher tolerance for residual emissions.
The European Union, for example, has committed to achieving carbon neutrality by 2050 through the European Climate Law and the European Green Deal. This target aligns with the Paris Agreement, which aims to limit global warming to a safe level of 1.5 degrees Celsius.
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Market-based tools
Marginal abatement cost refers to the marginal loss in company profits from avoiding the last unit of pollution or the cost of reaching a specified pollution target. Market-based tools are a critical approach to reducing pollution and are designed to address the market failure of externalities such as pollution. These tools provide incentives for polluters to reduce or eliminate negative environmental impacts by incorporating the external cost of production or consumption activities.
One such market-based tool is the use of economic or environmental taxes, charges, and subsidies. Placing a per-unit monetary charge on emissions or waste can reduce the quantity generated and shift the cost burden of these activities to polluters. Taxes create an incentive for firms to reduce pollution, as they can choose between paying the tax or reducing emissions at a lower cost. Similarly, subsidies can provide financial support for environment-friendly activities and the development and adoption of green technologies, thereby incentivizing behaviour changes.
Tradable permits and emissions charges are another example of market-based tools. A central authority allocates tradable permits, allowing firms to emit specific pollutants within a given period. Firms must have permits to cover all emissions, and the total number of permits across all emitters is the "cap". This creates a market for pollution permits, allowing flexibility in how and where pollution is reduced and ensuring emissions are reduced at the lowest possible cost.
However, it is important to note that market-based tools may not always be the best solution. In certain cases, command-and-control approaches may be preferred when regulators lack sufficient information to support market-based instruments or when dealing with emissions that have local or global impacts. Furthermore, there is a concern that market-oriented tools could potentially weaken strict limits on pollution emissions.
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Frequently asked questions
The marginal cost of pollution abatement refers to the marginal loss in company profits from avoiding the last unit of pollution or the marginal cost of reaching a specified pollution target.
A marginal abatement cost (MAC) curve is a popular policy tool that helps companies identify GHG emissions abatement potential and related abatement costs. It is used to determine the most cost-effective ways of reducing carbon emissions.
The marginal abatement cost is calculated by factoring in the cost of technologies that clean air or capture toxins and the amount of pollution that is reduced by the production process.
An example of an abatement cost is the cost associated with installing and using scrubbers to remove sulfur dioxide emissions from the exhaust of power plants. Another example is when companies invest in carbon offsetting activities such as tree planting or carbon capture.
