Fifty years ago a company’s annual report was a set of financial statements and a chairman’s letter. Today investors ask how much carbon the business emits, whether its factories depend on scarce water, how it treats its workers and who decides on these matters. The reason is not fashion.
Climate regulation, supply chain disruption, customer and employee expectations and the cost of capital now affect profit and value, and information that was once called “non-financial” turned out to be financial.
This topic traces the move from social and environmental accounting to sustainability reporting, defines sustainability reporting and its features, states its objectives and benefits, shows how sustainability matters appear in the financial statements through the existing standards, covers metrics and targets and the Nigerian drivers, and lists the problems and limitations. The next topic covers the main frameworks for sustainability reporting.
This area is examined as a written question. In November Diet, 2025, Question 6 (15 marks) asked for the key features of sustainability reporting (5 marks), its objectives and benefits (6 marks) and the importance of the International Sustainability Standards Board to global sustainability reporting (4 marks). Read the limitations of financial analysis, window dressing and creative accounting first.
In 30 seconds
Social and environmental accounting (1970s and 1980s) was mostly voluntary, qualitative and separate from the financial statements. Sustainability reporting is the structured disclosure of an entity’s environmental, social and governance (ESG) performance, risks and opportunities that affect its long-term ability to create value. Its features: forward-looking, materiality-driven, quantitative and qualitative, and integrated with financial information. Its objective is to give comparable, verifiable and material information to investors and others.
Sustainability matters reach the financial statements through impairment, provisions, decommissioning liabilities, inventory write-downs and financial instruments. Problems: lack of standardisation, data quality, greenwashing, cost and assurance.
From social and environmental accounting to sustainability reporting
Social and environmental accounting began in the 1970s and 1980s as part of corporate social responsibility. Social accounting reported on employees, welfare, community engagement, diversity and human rights; environmental accounting reported on pollution, resource use and waste. These reports were mostly voluntary, descriptive and published separately. Their limitations were:
- no standard metrics or frameworks, so reports could not be compared;
- they were disconnected from the financial statements and from business strategy;
- little influence on investment decisions or the allocation of capital; and
- they were often seen as public relations or compliance exercises rather than risk management.
Growing awareness of climate change, biodiversity loss, inequality and the United Nations Sustainable Development Goals led companies and investors to ask for a more complete and integrated view. Sustainability reporting emerged: it brings environmental, social and governance matters together, links the risks and opportunities to the business model, strategy and financial results, gives quantitative metrics, targets and forward-looking information, and aims to inform capital providers and improve long-term decisions.
Over the past decades voluntary frameworks were consolidated, and in 2023 the International Sustainability Standards Board issued the first global baseline standards (see the later topics).
What sustainability reporting is, and its features
Sustainability reporting is the structured disclosure of an entity’s environmental, social and governance performance, risks and opportunities that affect its long-term ability to create value. Its goal is comparable, verifiable and material information that helps users assess the effect of sustainability risks on financial performance and decisions. Its key features are that it is:
- Forward-looking: it includes scenario analysis, targets, forecasts and the alignment of strategy.
- Materiality-driven: it focuses on the matters that could affect enterprise value (or, in some frameworks, that have significant impacts on society).
- Quantitative and qualitative: key performance indicators such as emissions and water use are combined with narrative on governance and strategy.
- Integrated with financial information: it connects with the financial statements, as the standards on sustainability-related financial disclosures require.
- Stakeholder-oriented and verifiable: it responds to the information needs of users and is increasingly subject to assurance.
Objectives and benefits
- Objectives: to communicate performance and progress on ESG matters; to explain how sustainability-related risks and opportunities affect strategy and cash flows; to provide comparable information to investors and lenders; and to drive action by setting targets and tracking them.
- Benefits to the entity: better identification and management of risks; improved governance and internal controls; lower cost of capital and better access to finance; efficiency savings from lower energy, water and waste; stronger brand, customer and employee loyalty; and readiness for regulation.
- Benefits to investors and society: better information for allocating capital, comparability across entities and countries, accountability for impacts, and support for sustainable development.
How sustainability matters reach the financial statements
Sustainability issues can have direct financial effects, which are reported in the financial statements under the existing standards, as well as in narrative disclosures (management commentary and notes) explaining how ESG risks affect the business model, cash flows and access to finance.
| Sustainability matter | Financial statement effect |
|---|---|
| Climate-related impairment of assets | Impairment loss (International Accounting Standard (IAS) 36) |
| Carbon taxes or emission obligations | Provision (IAS 37) |
| Decommissioning and environmental clean-up | Asset and provision (IAS 16 and IAS 37) |
| Supply chain disruption | Inventory write-downs (IAS 2) |
| Restructuring for sustainability strategy | Provisions and disclosure (IAS 37, IAS 1, IAS 10) |
| Investment in renewables, green finance | IAS 16, IAS 38, International Financial Reporting Standard (IFRS) 9 |
For example, a mining company must restore a site in ten years at an expected cost of ₦500 million. At a discount rate of 8%, the provision on recognition is ₦500m ÷ 1.0810 = ₦231.6 million, added to the cost of the asset, and the unwinding of the discount in the first year is 8% × ₦231.6m = ₦18.5 million, a finance cost.
If a cash-generating unit exposed to climate-related demand has a carrying amount of ₦900m and a recoverable amount of ₦780m, the impairment loss is ₦120 million. A scheme that requires an entity to surrender allowances for emissions gives rise to a provision at the best estimate of the cost: emissions of 20,000 tonnes at ₦5,000 per tonne is ₦100 million.
Metrics and targets
Reporting entities disclose the key indicators they use to manage their sustainability-related risks and opportunities, and the targets and progress against them. Typical metrics are greenhouse gas emissions (scope 1: direct; scope 2: purchased energy; scope 3: the value chain), energy use, water intensity, waste, safety and workforce measures.
An intensity metric relates the measure to activity: emissions of 12,000 tonnes (scope 1) and 8,000 tonnes (scope 2) on revenue of ₦400 million give 20,000 ÷ 400 = 50 tonnes per ₦ million of revenue. A target would state the baseline, the date and the progress. Metrics should be consistent from year to year, so that trends can be seen.
Drivers in Nigeria and the limitations
In Nigeria the demand for sustainability reporting comes from investors and lenders looking for comparable information, from the Nigerian Exchange’s guidelines for listed companies (see the next topic), from sector regulators, from the Financial Reporting Council’s roadmap for adopting the international sustainability standards (see the last topic of this part), and from international supply chains and development finance that require evidence of ESG performance. The main problems and limitations are:
- Lack of standardisation and global uniformity: several frameworks and definitions, which makes comparison hard.
- Data quality: collecting reliable data across operations and the value chain, especially scope 3.
- Greenwashing: selective or exaggerated disclosure that makes performance look better than it is.
- Cost and capacity: skills, systems and internal controls are expensive to build.
- Assurance and verification: standards for assuring sustainability information are still developing.
- Estimation and forward-looking judgement: scenario analysis involves uncertainty.
The ideas in more depth
Why “non-financial” became financial
A flood-prone factory, a carbon price or a supplier’s forced labour finding can reduce cash flows, impair assets or add liabilities. When a matter can affect the numbers it belongs in a reporting system that connects it with them, which is why sustainability disclosures are now being tied to the financial statements.
Why verifiability matters
A target or a metric that cannot be checked invites greenwashing. The movement towards standards, consistent metrics and assurance is meant to give sustainability information the credibility that audited financial information has.
Sources and references
- International Financial Reporting Standard (IFRS) S1 General Requirements for Disclosure of Sustainability-related Financial Information; International Accounting Standard (IAS) 36 Impairment of Assets, IAS 37 Provisions, Contingent Liabilities and Contingent Assets, IAS 16 Property, Plant and Equipment and IAS 2 Inventories for the financial statement effects.
These points are stated as at 5 November 2026.
Worked examples
Example 1: a decommissioning provision. Restoration cost ₦500m in ten years; discount rate 8%. Required: the provision and the finance cost in year 1.
- Provision.
₦500m ÷ 1.0810 = ₦231.6m. - Unwinding.
8% × ₦231.6m = ₦18.5m.
Example 2: an emissions metric. Scope 1 emissions 12,000 tonnes, scope 2 8,000 tonnes, revenue ₦400m. Required: emissions intensity.
- Total. 20,000 tonnes.
- Intensity.
20,000 ÷ 400 = 50 tonnes per ₦ million.
Example 3: climate-related impairment. A unit has a carrying amount of ₦900m and a recoverable amount of ₦780m. Required: the impairment loss.
- Loss.
₦900m − ₦780m = ₦120m, recognised in profit or loss.
How to answer in the exam
- Define sustainability reporting in one sentence, then give the features, each with a line of explanation.
- Separate objectives from benefits, and give benefits for the entity and for users.
- Link to the financial statements with an example and the standard.
- Mention limitations to show balance.
Common mistakes in the exam
- Treating sustainability reporting as only environmental.
- Describing it as a public relations exercise.
- Listing features without explanation.
- Confusing the objectives with the benefits.
- Forgetting the financial statement effects.
- Ignoring greenwashing and standardisation as limitations.
Quick revision
- Social and environmental accounting: voluntary, qualitative, disconnected. Sustainability reporting: ESG, financial, forward-looking, metrics and targets.
- Features: forward-looking, materiality-driven, quantitative and qualitative, integrated.
- Statement effects: impairment, provisions, decommissioning, inventory, financial instruments.
- Limits: standardisation, data, greenwashing, cost, assurance.
Practice questions
These are original questions written in the style of the Institute’s exams. Try each one before you open the answer. Section A is a recall check, because the paper itself is written.
Recall check: multiple choice
Question 1. Early social and environmental accounting was mainly:
- Mandatory and standardised
- Audited
- Voluntary, qualitative and separate from the financial statements
- Connected to the cost of capital
Show the answer
C. It lacked standard metrics.
Question 2. Sustainability reporting is best described as:
- A tax return
- The structured disclosure of ESG performance, risks and opportunities affecting long-term value
- A marketing brochure
- An audit report
Show the answer
B. It is aimed at investors and other users.
Question 3. A feature of sustainability reporting is that it is:
- Forward-looking and materiality-driven
- Only historical
- Only qualitative
- Separate from strategy
Show the answer
A. It includes scenario analysis and targets.
Question 4. A carbon obligation under an emissions scheme is accounted for as:
- Revenue
- Equity
- An intangible asset only
- A provision, at the best estimate of the cost
Show the answer
D. Under IAS 37.
Question 5. A decommissioning obligation is recognised as:
- An expense only
- A provision at present value, with the cost added to the asset
- A contingent liability
- Equity
Show the answer
B. With the discount unwinding as a finance cost.
Question 6. A climate-related fall in the recoverable amount of an asset leads to:
- An impairment loss under IAS 36
- A revaluation surplus
- No effect
- An increase in profit
Show the answer
A. The carrying amount is reduced.
Question 7. Scope 2 emissions are:
- Direct emissions from owned sources
- Emissions from the value chain
- Indirect emissions from purchased energy
- Not measured
Show the answer
C. Such as electricity bought.
Question 8. Greenwashing means:
- Cleaning the factory
- Reducing waste
- Planting trees
- Selective or exaggerated disclosure that makes performance look better than it is
Show the answer
D. It damages credibility.
Question 9. An intensity metric relates a measure to:
- The share price
- Profit
- A unit of activity such as revenue
- Tax
Show the answer
C. For example tonnes per ₦ million of revenue.
Question 10. A limitation of sustainability reporting is:
- Lack of standardisation and variable data quality
- Excess of audit
- Lack of interest
- No link to risk
Show the answer
A. Also cost, assurance and greenwashing.
Section B style: written questions
Question 11 (10 marks). (a) Discuss the key features of sustainability reporting. (5 marks) (b) State the objectives and benefits of sustainability reporting. (5 marks)
Question 12 (15 marks). A company must restore a site in five years at an expected cost of ₦300m. The discount rate is 10%. (a) Calculate the provision on recognition. (5 marks) (b) Calculate the finance cost in year 1. (4 marks) (c) State where each amount is recognised. (6 marks)
A further written question
Question 13 (20 marks). A company’s emissions were 30,000 tonnes (scope 1), 10,000 tonnes (scope 2) and 4,000 tonnes (scope 3) on revenue of ₦800m. Next year it plans scope 1 and 2 emissions of 48,000 tonnes in total on revenue of ₦800m.
(a) Calculate the total emissions, and the emissions intensity for this year including all scopes. (6 marks) (b) Calculate the intensity of scope 1 and 2 for this year and for the plan, and the change. (6 marks) (c) State THREE limitations of sustainability reporting. (4 marks) (d) State TWO financial statement effects of climate-related risks. (4 marks)
Model answers
Show the model answer to Question 11
(a) It is forward-looking, with scenarios, targets and strategy (1). It is materiality-driven, focusing on matters that affect enterprise value (1). It combines quantitative indicators with narrative (1). It is integrated with financial information (1). It is aimed at users such as investors and is increasingly assured (1).
(b) Objectives: to communicate ESG performance and progress (1); to explain the effect of sustainability risks and opportunities on strategy and cash flows (1). Benefits: better risk management and governance (1), access to finance and lower cost of capital (1), efficiency savings and stronger reputation (1).
Show the model answer to Question 12
(a) ₦300m ÷ 1.105 = ₦300m ÷ 1.61051 = ₦186.3m (5).
(b) 10% × ₦186.3m = ₦18.6m (4).
(c) The provision is recognised as a liability and the same amount is added to the cost of the asset (3). The unwinding of the discount is recognised as a finance cost in profit or loss each year (3).
Show the model answer to Question 13
(a)
- Total emissions 30,000 + 10,000 + 4,000 = 44,000 tonnes (3).
- Intensity 44,000 ÷ 800 = 55 tonnes per ₦ million (3).
(b)
- This year scope 1 and 2: 40,000 ÷ 800 = 50 (2).
- Plan.
48,000 ÷ 800 = 60 (2). - The intensity rises by 20%, which is contrary to a reduction target (2).
(c) (Any three, 1.5 marks each) Lack of standardisation; poor data quality, especially scope 3; greenwashing; cost and capacity; developing assurance.
(d) (2 marks each) An impairment of assets under IAS 36 and a provision for carbon obligations or decommissioning under IAS 37.
Pathfinder on From social and environmental accounting to sustainability reporting
These are the ICAN Pathfinder questions that test this topic. ICAN owns the questions and the suggested solutions, so we point you to them and do not copy them. Open your Pathfinder, attempt each question under exam conditions, then check your answer against the notes above.
The question asks for the key features of sustainability reporting (5 marks), its objectives and benefits (6 marks) and the importance of the work of the International Sustainability Standards Board (4 marks).
Revise first: What sustainability reporting is, and its features
Source: ICAN Pathfinder, Financial Reporting. Diets covered: Every diet in the Pathfinder, from November Diet, 2021 to May Diet, 2026, was reviewed here. November Diet, 2025 tests this topic directly..
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