By | October 31, 2023

Within their debate about climate ambition, many organizations are discussing the costs of carbon abatement initiatives and technologies. The carbon abatement cost curve is often used for evaluating these costs. The marginal abatement cost of carbon, a common type of carbon pricing, is determined by the cost of a carbon reduction measure compared to the amount of carbon emissions saved over a given period of time (IPCC AR6 WGIII, 2022).

Most of these discussions, however, only consider the direct economic costs of carbon reduction and do not include the costs of climate change for companies or the costs for the business-as-usual scenario. Often it is already seen as an achievement when a CO2 price is used in some business areas as a control mechanism at all.

All too often, the related cost of carbon abatement projects defines the decision-making process of an organization on what kind of decarbonization initiatives a company will undertake. Adding the costs of climate change to the carbon abatement cost discussion helps to trigger management commitment and steer finances toward emission reduction plans, as well as create a more  comprehensive and transparent corporate climate strategy.

To achieve this, we suggest a modified approach when determining costs of carbon abatement. This combines feasibility studies on decarbonization levers and their related marginal carbon abatement costs, while also considering the climate-related financial impact on an organization. This approach brings new substance to corporate climate strategy discussions and strengthens the business case for implementing decarbonization.

Why Give Climate Change a Price Tag?

Empirical evidence reveals that decarbonization policies and the cost of transition to a low carbon future are incorrectly leaving out the social cost of climate change. While this is nowadays highly discussed in policymaking, it has not yet been applied in the corporate climate debate.

So, why put a price tag on climate change? The long-term macroeconomic effects of climate change show that 7% of global GDP per capita will disappear by 2100 as a result of business-as-usual carbon emissions. Over 10% of incomes in both Canada and the United States will vanish.

The business-as-usual carbon emissions scenario is the worst-case scenario for businesses. Climate change will impose steep costs. The question is: Why has this not been linked to corporate cost discussions related to carbon abatement?

The Background of the Missing Link

So, let us take a deeper look. In the Nature Climate Change article, “The cost of mitigation revisited,” which discusses this disregard in the policymaking context, the authors examine whether the cost of decarbonization focuses purely on the monetary cost of adopting emissions reduction initiatives or, instead, also considers the broader economic and social impacts of climate change itself and the economic co-benefits of avoided damage. The article mentions that framing climate action as costly is incorrect, as the cost of decarbonization, in most cases, does not include the negative impacts from climate change itself, nor the associated economic benefits of avoided impacts.

Estimating the aggregate economic effects of the physical impacts of climate change remains difficult. A lack of data, high uncertainties in regional climate change and the controversy of assigning costs to human lives, biodiversity or cultural heritage are among the challenges. However, only looking at the costs of climate change mitigation action is limited to a perspective on an idealized reference economy not considering already adopted climate policies or the benefits of past mitigation action.

A deeper reason why this discussion has been separated is that climate policy has been mainly influenced and driven by the IPCC, which has traditionally treated this as a separate issue. Working Group II focused on impacts of climate change, whereas Working Group III looked at mitigation. This explains why the cost of inaction (impact) is not well reflected in the costs of abatement (mitigation).

The 2022 IPCC’s AR6 Working Group III report highlights that most studies have used a cost-effectiveness analysis to develop mitigation pathways. This aims at comparing the costs of different mitigation strategies designed to meet a given climate change mitigation goal (e.g., an emission reduction target or a temperature-stabilization target). However, they do not incorporate economic impacts from climate change, nor the associated economic benefits of avoided impacts.

In short, omitting the economic impacts from climate change leaves out the cost of inaction. Omitting the economic benefits of avoided impacts leaves out part of the benefits of action. Climate policy helps to reduce massive adverse impacts which, if avoided or reduced, not only saves costs, but may also have economic co-benefits, such as increased standards of living, avoided conflicts over scarce resources and economic stability.

A New Approach in Corporate Climate Governance

On a scientific basis, the economic and social costs of climate change amount to roughly $180 per ton of CO2 equivalent (CO2e), a value 3.6 times higher than the value assigned by the U.S. government—$51 per ton of CO2e. The German Environmental Agency sees the cost of climate change at €237 per t CO2e. When accounting for intergenerational justice, the price should be set much higher, at €809 per t CO2e.

To counterbalance traditional carbon abatement cost curves, companies may want to include the impact of climate change and co-benefits such as business opportunities related to innovation and access to new markets. This would build a business case for implementing decarbonization policies to overcome the pledge vs. implementation gap in corporate climate decisions.

We suggest including the economic and social impacts of climate change in traditional marginal carbon abatement cost curves. This requires a new carbon abatement cost approach for corporations. In line with a double materiality approach, this harmonizes corporate climate risk assessments with carbon abatement curves by incorporating financial implications in the decision-making process. Giving climate risks a financial value must be combined with assessing the cost of climate action and mitigation strategies.

We suggest a modified approach when determining corporate costs of carbon abatement. This involves:

  1. The traditional approach: identifying, assessing and quantifying decarbonization options for organizations and developing a marginal carbon abatement cost curve for the reduction levers.
  2. In parallel, counterbalancing these costs with the cost of climate impacts for corporations in both macroeconomic (e.g., stated policies) as well as company-specific scenarios (business as usual / no reduction levers applied).
  3. Understanding the co-benefits of both macroeconomic policies (further cost reduction over time of abatement technology), as well as co-benefits of reduction activities (driving innovation, further cost reduction over time of abatement technology, accessing new markets, etc.).

In the end, this exercise combines feasibility studies on decarbonization levers and their related marginal carbon abatement costs, while also considering the financial assessment of climate-related risks and opportunities. This approach brings new substance to corporate climate strategy discussions and strengthens the business case for decarbonization. 

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