Around the world, the impacts of climate change are accelerating. More frequent and more intense extreme weather events are causing increasing levels of damage to infrastructure and ecosystems, often resulting in loss of life and severe economic impacts. Meanwhile, rising water and food insecurity are affecting more and more communities, and the health impacts of a warming planet are taking an increasing toll.
Against this backdrop, the need to invest in climate adaptation is growing rapidly. Developing countries are estimated to require between US$310 and $365 billion per year for adaptation by 2035, yet available finance is a fraction of this. International public adaptation finance has declined slightly – from $28 billion in 2022 to $26 billion in 2023 – while private sector contributions remain limited at around $5 billion annually.
With public resources stretched thin and declining, bridging this massive financial shortfall will increasingly depend on unlocking the vast, untapped potential of private capital.
Why is private sector engagement in adaptation still limited?
Many adaptation actions have strong public-good characteristics. Investments such as climate information services, ecosystem restoration and resilient public infrastructure deliver broad societal benefits, but do not generate direct or predictable revenue streams, making them less attractive for commercial finance.
Even where adaptation generates clear social or economic benefits, these benefits are often difficult to quantify, monetize or attribute in ways that support a robust business case or reliable return on investment. Moreover, climate risk and adaptation data is often fragmented, not decision-useful, or not translated into the financial metrics that banks, insurers and firms require for pricing, underwriting, due diligence and investment appraisal.
Policy and regulatory frameworks can further constrain engagement. In many contexts, they do not yet provide clear incentives for investment in climate resilience, while many firms and financial institutions still lack the technical capacity to identify viable adaptation-relevant business models. In addition, many private actors remain unaware of the business relevance of adaptation and its role in managing climate risk, further limiting engagement.
At the same time, there is often a limited pipeline of opportunities that are aligned with national priorities and structured in a way that enables private sector participation.
What does private sector engagement in adaptation actually look like?
Private sector engagement in adaptation goes well beyond mobilizing private investment. Private actors contribute in different ways, with different incentives, risk appetites and entry points, so should not be treated as a single pool of capital.
Some firms engage as adaptors, investing in the resilience of their own operations, assets, supply chains, and workforces in response to physical climate risks. Others act as financiers, providing loans, equity, guarantees, or insurance where adaptation activities generate identifiable revenue streams, cost savings, or risk-adjusted returns.
Private actors also play a role as innovators, developing technologies, data and analytics, and new business models such as climate risk services, parametric insurance, resilient agricultural inputs, and water-efficient solutions. They can also be partners and enablers, helping shape standards, policy design, and multi-stakeholder planning processes.
In addition, at the local level, actors such as micro, small and medium enterprises (MSMEs), cooperatives and utilities are often central to implementing and sustaining adaptation solutions over time.
Effectively engaging the private sector therefore depends on understanding what motivates each of these actors and designing entry points, incentives, and support mechanisms accordingly.
When is private finance the right fit for investments in adaptation?
Private finance is more relevant where adaptation actions generate identifiable revenue streams, user fees, cost savings, productivity gains, or other payment mechanisms that can support repayment or return.
For an adaptation opportunity to be investment-ready, several elements are typically needed: a clear climate rationale, reliable and decision-useful data, a viable revenue or payment mechanism, enabling policy and regulatory conditions, an appropriate risk-sharing structure, and a credible sponsor with implementation capacity. Strengthening these elements helps countries ensure that private finance is mobilized where it is appropriate and effective.
Nevertheless, identifying investment-ready adaptation opportunities is not always easy. Some can carry commercial potential but, due to market failures, policy gaps, or risk perceptions, require public support and de-risking to enable private investment.
How can public support help unlock private investment in adaptation?
Public support from governments, public finance institutions, climate funds and development partners helps unlock private investment in adaptation in two main ways: by sharing financial risks that private actors cannot absorb on their own, and by creating the enabling conditions that make investment viable in the first place. Governments have a particularly important role in this respect, as they shape the legal, fiscal, regulatory and planning frameworks that determine whether private actors can engage.
On the financial side, public actors can deploy instruments such as concessional debt, guarantees, first-loss facilities, blended finance structures, insurance support, and results-based payments. These help reduce risks, lower costs and make adaptation opportunities more attractive to private investors.
However, financial instruments alone are rarely sufficient. Private investment in adaptation also depends on strong policy, regulatory and fiscal conditions. This includes cost-recovery rules, tax incentives, subsidy structures, payment frameworks, land and water governance arrangements, and stronger integration of climate adaptation into national planning and public investment processes.
Public finance is also essential for funding upstream public goods that private actors depend on but cannot provide themselves. These include climate information systems, weather and risk data, early warning infrastructure, land-use planning, and other resilience-related services.
Sequencing matters. In most cases, private investment in adaptation becomes viable only after public policy, institutions and upstream public investment have laid the groundwork.
What are some successful examples of private sector engagement in adaptation?
Successful private sector engagement in adaptation typically builds on strong public foundations, rather than relying on private capital alone.
In Kenya, the Upper Tana-Nairobi Water Fund, supported by The Nature Conservancy and a coalition of public authorities, water users, businesses, and development partners, finances upstream watershed restoration to reduce erosion and strengthen water security for Nairobi and downstream users. Clear incentives and shared benefits have helped bring both public and private actors to the table.
In Pacific Island countries, the Pacific Insurance and Climate Adaptation Programme, implemented by the United Nations Development Programme (UNDP), the United Nations Capital Development Fund (UNCDF), and the United Nations University Institute for Environment and Human Security, has developed parametric insurance through partnerships with insurers, governments and local delivery channels. This insurance model demonstrates how public support, technical assistance and market development can help create viable conditions for private participation in highly climate-vulnerable contexts.
In Costa Rica, a deforestation-free beef certification scheme, piloted under the UNDP–FAO SCALA Programme with the Livestock Corporation and the Costa Rican Institute of Technical Standards – and facilitated by SCALA Private Sector Engagement Guidance Series – has helped surface the practical barriers producers face in adopting sustainable land management practices and the support needed to meet certification standards.
How is the Adaptation Accelerator Hub helping to unlock private investment in adaptation?
Led by the Government of Italy with UNDP as the partner agency, the Adaptation Accelerator Hub (AAH) supports countries to systematically assess and structure adaptation opportunities. The AAH works with governments to distinguish between what should be publicly financed, what can be supported through blended finance, and what is genuinely investment-ready for private sector participation.
As part of this work, the Hub is developing a practical approach for private sector engagement in adaptation, helping countries identify where private actors can play a meaningful role and what public support, incentives and enabling conditions are needed to unlock that engagement. The Hub also helps sequence these elements, ensuring that enabling conditions and public investments are in place before private finance is mobilized. This approach helps avoid unrealistic expectations of private investment and instead targets it where it is most appropriate and effective. In doing so, the AAH helps translate national adaptation priorities into practical, finance-ready solutions.
Can private finance help close the adaptation finance gap?
Closing the adaptation finance gap will require a more deliberate and strategic approach to private sector engagement. Not all adaptation needs can or should be met by private finance, but where the right conditions are in place, it can play a critical role. Strengthening these conditions – from data and policy to investment pipelines – will be essential.
With the right mix of public support and targeted engagement, private investment can help scale adaptation efforts where they are needed the most.