33 Carbon and the Net-Zero Transition

Learning Objectives

You will be able to:

Explain what a carbon footprint is and how emissions are divided by scope.
Distinguish net zero from carbon neutrality, and explain what each commits a firm to.
Describe the abatement hierarchy and explain why offsets sit at the end of it.
Identify the instruments through which carbon acquires a price, including at the border.
Evaluate a company’s decarbonisation commitment and assess its strategic and financial implications.

33.1 Introduction

Chapter 32 treated climate as a risk to be assessed. This chapter treats it as a programme to be executed, because the transition is not only something that happens to a firm. It is something the firm does, and the doing has a cost, a sequence and a set of choices that are frequently made badly (Anne T. Lawrence & James Weber, 2020).

The subject attracts more loose language than any other in this module. Firms announce net zero targets without a baseline, describe products as carbon neutral on the strength of purchased credits, and set 2050 commitments that commit nobody currently employed. Chapter 34 examines the integrity of such claims. This chapter provides what is needed to tell a real programme from a announced one.

flowchart TD
    A["<b>Measure</b><br>footprint by scope,<br>with a stated boundary<br>and base year"] --> B["<b>Avoid</b><br>do not create<br>the emission"]
    B --> C["<b>Reduce</b><br>efficiency, process change,<br>materials"]
    C --> D["<b>Substitute</b><br>renewable power,<br>fuel switching,<br>electrification"]
    D --> E["<b>Residual emissions</b><br>what remains after<br>all of the above"]
    E --> F["<b>Remove</b><br>offset or removal<br>for the residual only"]
    F --> G["<b>Net zero</b>"]
    style A fill:#e3f2fd,stroke:#1976D2
    style E fill:#fff8e1,stroke:#F9A825
    style F fill:#ffebee,stroke:#C62828
    style G fill:#e8f5e9,stroke:#388E3C

33.2 Measuring a Footprint

Chapter 30 introduced the three scopes. The distinction determines what a target actually covers, so it repays precision.

The Three Scopes

Scope	What it covers	Where the data comes from
Scope 1	Direct emissions from sources owned or controlled: boilers, furnaces, process emissions, company vehicles, refrigerant leakage	Own meters, fuel purchase records, process calculations
Scope 2	Indirect emissions from purchased electricity, steam, heat and cooling consumed by the firm	Electricity bills and grid emission factors, or supplier-specific factors
Scope 3	All other value chain emissions, upstream and downstream, including purchased goods and services, capital goods, transport, business travel, use of sold products, and end-of-life treatment	Supplier data where it exists, spend-based or activity-based estimation where it does not

For most companies Scope 3 dominates, often by a large multiple, and for a retailer, a bank or a brand it is essentially the whole footprint. It is also the hardest to measure, because the data belongs to other parties, and estimation methods vary widely in quality. A firm that reports Scope 1 and 2 and omits Scope 3 has reported the small part.

Two further definitions govern whether a number means anything.

The boundary states which entities are included: whether by equity share, by financial control, or by operational control. A firm can appear to reduce emissions by changing the boundary, which is the first of the signals Chapter 31 listed.

The base year is the point against which reduction is measured. It must be stated, and it must be recalculated when the boundary changes materially, otherwise a target measures nothing.

33.3 Net Zero and Its Relatives

Common Misconception: Net Zero and Carbon Neutral Mean the Same Thing

They do not, and the difference is the whole subject of this chapter.

Carbon neutral typically means that a firm’s measured emissions in a period are matched by an equivalent quantity of credits purchased. It says nothing about whether the emissions themselves fell. A company can be carbon neutral every year while its emissions rise, provided it buys more credits.

Net zero means reducing emissions across the value chain to as close to zero as feasible, in line with a defined trajectory, and neutralising only the residual that cannot be eliminated, usually through permanent removal rather than avoidance credits. The commitment is to the reduction; the neutralisation applies only to what is genuinely left.

Three further terms recur. Science-based describes a target whose trajectory is consistent with a stated global temperature goal rather than chosen for convenience. Intensity target commits to emissions per unit of output or revenue, which is compatible with rising absolute emissions in a growing firm. Absolute target commits to a total, which is what the atmosphere responds to.

The practical test on any announcement is four questions. Absolute or intensity? Which scopes? What base year and what interim milestone? And what share of the reduction is expected to come from purchased credits rather than from the firm’s own operations?

33.4 The Abatement Hierarchy

Decarbonisation follows a sequence, and taking the steps out of order is the commonest and most expensive error.

Step	What it means	Typical measures
Avoid	Do not create the emission at all	Eliminating an unnecessary process step, redesigning a product, ending a low-value high-emission line, reducing transport by changing sourcing geography
Reduce	Create less of it for the same output	Energy efficiency, heat recovery, motor and drive upgrades, insulation, yield improvement, reduced material use
Substitute	Meet the same need with a lower-carbon input	Renewable power procurement, fuel switching, electrification of heat where feasible, lower-carbon materials
Remove	Neutralise what remains	Removal credits for genuinely residual emissions

The order matters for three reasons. Efficiency measures usually have the shortest payback and often a negative cost, so a firm that begins with procurement of credits has spent money it could have earned. Substitution is cheaper once demand has been reduced, since a smaller renewable contract or a smaller electrification project is required. And the credibility of any residual claim depends on having demonstrably done the preceding steps.

33.4.1 Offsets and Credits

An offset is a claim to a reduction or removal of emissions elsewhere, purchased to compensate for emissions here. The instrument is legitimate in principle and problematic in practice, and a manager should know the four tests.

Testing a Credit

Test	The question
Additionality	Would the reduction have happened anyway, without the credit revenue? If yes, nothing has been added
Permanence	Will the carbon stay out of the atmosphere? Forestry can burn or be cleared; geological storage is more durable
Leakage	Did the activity simply move elsewhere, so that protected forest here means cleared forest there?
Double counting	Is the same reduction being claimed by more than one party, including by the host country toward its own commitment?

Avoidance credits, which pay for an emission not to occur, are harder to verify on all four tests than removal credits, which pay for carbon to be taken out and stored. That is why serious net zero definitions restrict neutralisation of residual emissions to removals.

Practitioner Insight: Build the Marginal Abatement Cost Curve Before Setting a Target

The sequence most firms follow is to announce a target and then discover what it costs. Reversing it produces both a better target and a defensible one.

For every identified measure, calculate two numbers: the tonnes of carbon dioxide equivalent it abates per year, and its cost per tonne, taking the net present cost including energy savings. Some measures will have a negative cost, meaning they pay for themselves; efficiency measures usually do. Rank them from cheapest to most expensive and plot cumulative abatement against cost.

The curve answers questions a target alone cannot. How much reduction is available at negative or zero cost, which is the part a firm should do regardless of any commitment. Where the cost begins to rise steeply, which is where the realistic near-term target sits. What the residual is after everything currently available, which is what neutralisation must cover. And which measures need a technology that does not yet exist at price, which is what a longer-dated commitment actually depends on.

A board presented with this curve can set a target it can defend. A board presented with a target alone is agreeing to an aspiration whose cost will be discovered by someone else later.

33.5 How Carbon Acquires a Price

Emissions become a cost through several distinct mechanisms, and a manager should know which ones reach their business.

Direct pricing covers taxes on carbon content and emissions trading systems in which allowances are traded. India has operated market mechanisms for energy efficiency and renewable purchase, and a domestic carbon credit trading scheme has been established under energy conservation legislation, with obligated sectors notified over time.

Implicit pricing covers taxes and levies on fuels, and regulatory requirements that raise the cost of emitting activity without naming carbon.

Border measures are the mechanism most consequential for Indian exporters. A carbon border adjustment applies a charge on imports based on the emissions embedded in them, so that goods entering a market with a carbon price face a cost comparable to goods produced within it. For an exporter in a carbon-intensive sector such as steel, aluminium, cement or fertiliser, this converts the domestic grid’s emissions intensity into a direct cost of market access, whether or not India prices carbon domestically.

Internal carbon pricing is a firm’s own decision to apply a notional price to emissions in investment appraisal. It has no external validity and considerable internal value, because it makes a lower-carbon option compete on the numbers rather than on assertion. Applied as a shadow price in capital approval, it prevents the asset life mismatch described in Chapter 32.

33.6 Case Studies

33.6.1 Case Study 1: The Target Without a Curve

The following situation is constructed rather than reported.

A listed manufacturer announces a commitment to net zero by 2050, with no interim target, covering Scope 1 and 2. The announcement is well received. Eighteen months later the sustainability head presents the first abatement analysis. It shows that roughly a fifth of the required reduction is available at negative cost, a further quarter at moderate cost, and the remainder depends on process technology not commercially available and on grid decarbonisation the company does not control. The capital plan contains no provision for any of it. No individual currently employed will be in post in 2050.

Discussion questions

Apply the four questions from the misconception callout to this announcement. What does each reveal?
Identify what the company should have done before announcing, and what it should do now.
The commitment excludes Scope 3. For a manufacturer, estimate what share of the real footprint is therefore outside the target, and say what the announcement is worth.

33.6.2 Case Study 2: The Neutral Product

The following situation is constructed rather than reported.

A consumer goods company markets a product line as carbon neutral, supported by credits purchased from a forestry protection project. Investigation of the project shows that the area was under limited threat of clearance, that the baseline against which avoided emissions were calculated assumed a high deforestation rate, and that the host country counts the same reductions toward its own commitment. The company’s own emissions for the product line rose during the period.

Discussion questions

Apply the four credit tests. Which does this project fail and how seriously?
The company has not lied about anything it stated. Explain what is wrong, and connect it to Chapter 9’s treatment of the half-truth.
What would the company have to do to make a defensible claim about this product, and what could it honestly say in the meantime?

33.6.3 Case Study 3: The Border That Priced the Grid

The following situation is constructed rather than reported.

An Indian aluminium extrusion company exports a substantial share of output to a market introducing a carbon border adjustment. Its own process is efficient by regional standards, but its electricity comes from a grid with a high coal share, making its Scope 2 emissions per tonne well above competitors supplied by hydro or nuclear grids. The charge will be calculated on embedded emissions. The company cannot change the national grid and has not previously considered its power source a competitive variable.

Discussion questions

Explain how a policy in another country converts the Indian grid mix into this company’s cost, and which of Chapter 29’s channels is operating.
What options does the company actually have? Rank them by cost, lead time and the share of the exposure each addresses.
What does this case imply for the investment appraisal of any new capacity the company builds, and what tool from this chapter would have surfaced it?

33.7 Applying the Chapter

Exercise: Designing a Decarbonisation Programme

Return to the textile and apparel group from Chapters 29 to 32. Recall its profile: two spinning units, a dyeing and processing unit in a water-stressed basin running a coal-fired boiler for process steam, two garment units near a coastal city, grid power with a significant coal share, cotton sourced from domestic farms and traders, half of output exported to European and North American brands, two of which have announced supplier emissions requirements with dates.

Working in a group, design the programme. CO-5 requires evaluation of obligations and assessment of strategic implications for long-term value, so the deliverable must reach a defensible commitment with its cost and consequences stated.

Scope the footprint. For each scope, identify this group’s principal emission sources. Estimate which scope dominates and by roughly what order of magnitude, and state which sources you could measure now and which require data you do not hold.
Set the boundary and base year. State which entities you include and on what basis, choose a base year, and explain what would require recalculation.
Build the abatement list. Identify at least ten measures across the hierarchy, allocating each to avoid, reduce, substitute or remove. Pay particular attention to the coal boiler and to grid power.
Rank by cost. Without precise figures, order the measures from most likely negative cost to most expensive, and state your reasoning for each placement. Identify which measures the group should do regardless of any target.
Identify the residual. State what remains after all currently available measures, and what neutralising it would require. Apply the four credit tests to any offset you would consider.
Design the commitment. Propose a target: absolute or intensity, which scopes, base year, interim milestone and end date, and the share expected from the firm’s own operations. Justify every element.
Assess the customer requirement. State whether your programme satisfies what the two brands have announced, by their dates. If it does not, say what else is needed and what the consequence of failing is.
Assess strategic implications. State what the programme costs, what it protects, and what it could win. Identify the single decision that must be taken this year and cannot be deferred, and say why.
Recommend governance. Name who owns the programme, how the board oversees it, what is disclosed and when, and what internal carbon price you would apply in capital appraisal.

Present an abatement table ranked by cost, a residual and neutralisation note, the proposed commitment with justification, and a two-page strategic assessment.

33.8 Summary

Chapter Summary

The transition is a programme a firm executes, with a cost, a sequence and choices that are frequently made badly (Anne T. Lawrence & James Weber, 2020). Emissions are measured by scope: direct from owned sources, indirect from purchased energy, and everything else across the value chain. Scope 3 dominates for most firms and is essentially the whole footprint for a retailer, bank or brand, so a firm reporting Scope 1 and 2 alone has reported the small part. A footprint means nothing without a stated boundary, since changing it can manufacture a reduction, and a base year that is recalculated when the boundary changes materially.

Carbon neutral and net zero are different commitments. Carbon neutral typically means emissions in a period matched by purchased credits and says nothing about whether emissions fell; a company can be neutral every year while emitting more. Net zero means reducing across the value chain along a defined trajectory and neutralising only the genuinely residual, usually through removals. Science-based describes a trajectory consistent with a temperature goal; an intensity target is compatible with rising absolute emissions in a growing firm, and an absolute target is what the atmosphere responds to. Four questions test any announcement: absolute or intensity, which scopes, what base year and interim milestone, and what share comes from purchased credits.

The abatement hierarchy runs avoid, reduce, substitute, remove, and the order matters because efficiency often has negative cost, substitution is cheaper once demand is reduced, and any residual claim depends on having demonstrably done the earlier steps. Credits must pass four tests: additionality, permanence, leakage and double counting. Avoidance credits are harder to verify than removals, which is why serious net zero definitions restrict neutralisation to removals.

A marginal abatement cost curve should be built before a target is set, plotting cumulative abatement against cost per tonne. It reveals how much reduction is available at negative cost and should be done regardless of commitment, where cost rises steeply and the realistic near-term target therefore sits, what residual remains, and which measures depend on technology not yet available at price.

Carbon acquires a price through direct pricing including India’s carbon credit trading scheme, implicit pricing through fuel taxes and regulation, border adjustments which convert a domestic grid’s emissions intensity into a direct cost of export market access, and internal carbon pricing, which has no external validity and considerable internal value because it makes the lower-carbon option compete on numbers in capital appraisal.

Key Terms

Scope 1 · Scope 2 · Scope 3 · Boundary · Equity share and control approaches · Base year · Base year recalculation · Carbon neutral · Net zero · Science-based target · Intensity target · Absolute target · Interim milestone · Abatement hierarchy · Avoid · Reduce · Substitute · Remove · Residual emissions · Offset · Additionality · Permanence · Leakage · Double counting · Avoidance and removal credits · Marginal abatement cost curve · Negative cost measures · Carbon tax and trading · Border adjustment · Embedded emissions · Internal carbon price · Shadow price in appraisal

Summary

Concept	Description
Measuring
Scope 1	Direct emissions from sources the firm owns or controls, including process and refrigerant leakage
Scope 2	Indirect emissions from purchased electricity, steam, heat and cooling that the firm consumes
Scope 3	All other value chain emissions, upstream and downstream, including use of sold products
Scope 3 dominance	The fact that Scope 3 usually exceeds the others by a large multiple and is the whole footprint for some
Boundary	The statement of which entities are included, whose alteration can manufacture an apparent reduction
Base year	The point against which reduction is measured, which must be recalculated when the boundary shifts
Defining the Target
Carbon neutral	Emissions matched by purchased credits, which is compatible with emissions rising every year
Net zero	Reduction along a trajectory with neutralisation only of what genuinely remains
Science-based target	A trajectory consistent with a stated temperature goal rather than chosen for convenience
Intensity target	A commitment per unit of output or revenue, compatible with rising absolute emissions
Absolute target	A commitment to a total, which is what the atmosphere actually responds to
The four questions	Absolute or intensity, which scopes, base year and milestone, and share from purchased credits
The Hierarchy
Abatement hierarchy	The sequence in which decarbonisation should be pursued
Avoid	Not creating the emission at all, through redesign, elimination or changed sourcing
Reduce	Creating less for the same output, through efficiency, recovery and yield improvement
Substitute	Meeting the same need with a lower-carbon input, through renewables, fuel switching or electrification
Remove	Neutralising what remains, appropriate only for genuinely residual emissions
Residual emissions	What is left after every available measure, and what neutralisation must cover
Why the order matters	Efficiency often costs nothing, substitution is cheaper after reduction, and credibility depends on sequence
Offsets
Offset	A purchased claim to a reduction or removal elsewhere, compensating for emissions here
Additionality	Whether the reduction would have happened anyway without the credit revenue
Permanence	Whether the carbon will stay out of the atmosphere, which forestry cannot guarantee
Leakage	Whether the activity simply moved elsewhere rather than ceasing
Double counting	Whether more than one party, including the host country, claims the same reduction
Avoidance versus removal credits	The distinction explaining why serious net zero definitions restrict neutralisation to removals
The Cost Curve
Marginal abatement cost curve	The plot of cumulative abatement against cost per tonne, built before a target is set
Negative cost measures	The measures that pay for themselves, which a firm should undertake regardless of any commitment
Where cost rises steeply	The point on the curve at which the realistic near-term target sits
Pricing Carbon
Carbon tax and trading	Direct pricing through levies on carbon content and traded allowances
Border adjustment	A charge on imports based on their embedded emissions, equalising with domestically priced goods
Embedded emissions	The emissions attributable to a good's production, which a border measure converts into a cost
Internal carbon price	A firm's own notional price applied in appraisal, making the lower-carbon option compete on numbers