Sustainability disclosure has crossed a decisive threshold. What was once treated as voluntary corporate responsibility reporting is now embedded within enterprise risk management, capital allocation, and long-term value resilience. Sustainability risks like climate change, biodiversity loss, social-related issues, and governance failures are no longer minor concerns; they are reshaping asset valuations, supply chain resilience, and financial performance.
In response to this significant shift, the International Sustainability Standards Board (ISSB), under the IFRS Foundation,issued two disclosure standards, IFRS S1 and IFRS S2, establishing a global baseline for sustainability-related financial disclosures. These standards do not expand sustainability reporting for its own sake; they formalise the integration of sustainability risk into financial decision-making.
At the centre of adopting and implementing the ISSB’s disclosure standards lies a strategic approach: climate first, but not climate only.
IFRS S1 establishes the general requirement, where entities must disclose all sustainability-related risks and opportunities that could reasonably be expected to affect enterprise value, including impacts on cash flows, cost of capital, and access to finance across the short, medium, and long terms.
IFRS S1 creates a structured framework for identifying, assessing, and disclosing sustainability-related exposures across the environmental, social, and governance landscape. It is interoperable with other frameworks and capable of scaling as disclosure practices mature globally.
In effect, IFRS S1 ensures that sustainability risk is treated as enterprise risk.
While IFRS S1 provides the general framework, IFRS S2 operationalises its most urgent component: climate risk. IFRS S2requires disclosure of:
Climate risk is addressed not as an environmental issue but as a financial exposure capable of impairing asset values, altering operating costs, and reshaping business models.
The framing is unmistakable: climate risk is financial risk.
ISSB introduced transition relief, allowing entities, in their first reporting period, to focus initially on climate-related disclosures while still ensuring compliance. This is not a weakening of disclosure requirements; it is rather a practical and realistic way to help organisations get started without being overwhelmed.
Climate comes first for many reasons, some of which are the following:
Decarbonisation commitments, carbon pricing mechanisms, and transition policies are reshaping market conditions under defined timelines. Climate exposure is not theoretical; it is being repriced in real time through regulatory trajectories and investor expectations.
2.Climate Risk is systemic
Unlike many sustainability risks that vary by sector, climate risk affects all industries and geographies. Physical risks (floods, heatwaves, droughts) and transition risks (policy shifts, carbon pricing, technological disruption) affect infrastructure, supply chains, insurance markets, agriculture, energy systems, and financial stability. No sector is insulated.
3.Climate Serves as the Gateway to Broader Sustainability Integration
Measurement methodologies, emissions accounting protocols, and scenario analysis tools are more advanced for climate than for other sustainability areas. Climate, therefore, offers the most practical entry point for building governance, controls, and reporting systems that can later be extended to broader sustainability risks.
Prioritising climate risks enhances comparability, builds institutional capability, and responds to urgent investor demand without overwhelming preparers in the first year of adoption.
Yet climate is not the whole of the sustainability risks.
Under IFRS S1, entities are ultimately required to disclose all sustainability-related risks that could affect enterprise value. Sustainability-related risks such as biodiversity degradation, water scarcity, labour instability, supply chain vulnerabilities, and governance failures are increasingly financially consequential.
A climate-only focus would create an incomplete risk picture.
Sustainability risks are interdependent. For instance, a transition strategy may increase water demand, renewable infrastructure development may affect land use and biodiversity, and workforce transitions may create social and political pressures. Ignoring these linkages risks unintended financial exposure. The ISSB framework avoids this silo effect by embedding climate within a broader enterprise-value-focused sustainability strategy.
Climate may be the entry point, but integrated sustainability is the destination.
For emerging markets, particularly across Africa and other developing economies, a climate-first approach carries additional strategic value.
Adopting the standards in a phased manner allows jurisdictions to:
‘Climate-first’ becomes not merely a compliance relief but a developmental strategy which enables markets to meet global investor demands while constructing the broader systems required for full-scope sustainability disclosure. In this sense, climate-first is not a compromise; it is rather a pathway.
The ISSB standards establish a global minimum. They are not the ceiling.
By structuring implementation around climate first, the ISSB acknowledges urgency without compromising the scope. The phased approach allows for:
This is not incrementalism. It is a calibrated transformation.
The approach ensures that sustainability disclosure evolves from compliance reporting to integrated strategic risk management.
The Strategic Takeaway
For boards, executives, regulators, policymakers, and all stakeholders, the message is clear. Climate-first implementation is not an excuse to narrow sustainability ambition; it is a transition strategy designed to integrate sustainability risk into financial decision-making.
The objective is an integrated sustainability approach, where climate, nature, social, and governance risks are assessed collectively through the lens of enterprise value and long-term resilience.
Climate may open the door, but long-term competitiveness will depend on how well organisations move beyond it.
What has been your organisation’s biggest hurdle in integrating sustainability beyond climate?
Written by: Sunday Ojo | Assistant Manager, ESG Advisory Services
Harley Reed (Nigeria)
