Beyond Green Bonds: How Developing Economies Can Mobilize Trillions for Climate Investment

EMDEs face annual climate-finance needs of $1.4–$5 trillion, making stronger economic reforms, credible climate policies and greater private investment essential to closing the gap. The IMF argues that governments and development partners should use scarce public and concessional funds strategically to reduce risks, build bankable projects and mobilize private capital without undermining fiscal stability.

Climate investment is emerging as one of the biggest financing challenges for developing economies, but simply increasing the supply of green money will not be enough. An International Monetary Fund working paper argues that emerging market and developing economies (EMDEs) need to fundamentally improve the conditions under which private capital operates if they are to close climate-investment gaps running into trillions of dollars.

Prepared by Chen Chen, Charlotte Gardes-Landolfini, Annapurna Mitra and Henk Jan Reinders, the study puts macroeconomic stability, structural reforms and credible climate policies at the heart of the financing agenda. Its message to governments and development partners is clear: scarce public resources should be used strategically to unlock private investment rather than attempting to finance the transition primarily from government budgets.

A Trillion-Dollar Investment Challenge

The scale of the requirement makes greater private participation unavoidable. The paper estimates that EMDEs could require between $1.4 trillion and $5 trillion annually in gross climate finance over the next decade. Adaptation alone could require approximately $400 billion to $1 trillion every year through 2030.

Globally, gross mitigation investment needs are estimated at between $2 trillion and $9 trillion, with around one-third required in EMDEs. Climate-related investment could rise from roughly 3% of total EMDE investment currently to at least 12%.

Yet capital is not flowing proportionately to where it is needed. EMDEs excluding China account for only around 15% of global clean-energy expenditure, while fossil-fuel investment continues in many developing economies.

The financing challenge therefore comes at a difficult moment. Many governments already face elevated debt, high borrowing costs, and competing expenditure demands across healthcare, education, infrastructure, and social protection.

Lowering Risk Could Unlock Private Capital

The IMF framework suggests policymakers should begin by addressing the underlying economics of investment rather than immediately turning to subsidies.

Macroeconomic stability, sustainable public finances, predictable regulation, rule of law, stronger institutions and deeper financial markets can reduce risk premiums and the cost of capital. Sovereign credit risk is especially important because expensive government borrowing tends to raise financing costs across the wider economy.

This matters for climate investment because renewable energy, electricity grids and resilient infrastructure frequently require large upfront expenditure. Higher financing costs can quickly turn potentially viable projects into unattractive investments.

Climate-specific policies must complement these reforms. Carbon pricing, emissions-trading systems, renewable-energy incentives, efficiency standards and fossil-fuel subsidy reforms can improve the relative economics of low-carbon investment.

Governments also need credible climate strategies, transparent disclosure systems and taxonomies that help investors distinguish genuinely sustainable activities from greenwashing.

The potential fiscal opportunity is considerable. Estimates cited by the study indicate that phasing out fossil-fuel subsidies could potentially free as much as $1 trillion, while redirecting fossil-fuel investment could shift another $726 billion toward cleaner and more resilient activities.

Such reforms, however, carry political and social risks. Higher energy prices can disproportionately affect poorer households, making sequencing, targeted compensation and social protection essential components of climate-finance strategies.

Development Finance Must Work Harder

International development partners remain crucial, particularly where projects cannot generate sufficient commercial returns.

International concessional climate finance has only recently moved beyond the $100 billion-a-year level, leaving a vast gap compared with investment requirements measured in trillions. The implication for multilateral development banks, bilateral donors and development finance institutions is that concessional resources must generate greater leverage.

Blended finance offers one route. Governments and development institutions can provide guarantees, concessional loans, public equity, grants or first-loss capital to reduce risks and make projects attractive to commercial investors.

But the IMF cautions against treating blended finance as a substitute for reform. Evidence examined in the study indicates that infrastructure transactions using blended finance mobilised only around 40 cents of private investment for every $1 of public or philanthropic capital between 2013 and 2023.

Guarantees and public-private partnerships can also create contingent liabilities and fiscal risks. The policy objective should therefore be to provide only the minimum public support required to make worthwhile projects commercially viable.

Development partners can potentially achieve greater impact by combining financing with project preparation, institutional capacity building and regulatory reform. Country platforms that bring governments, development institutions and investors around nationally determined investment programmes could also reduce fragmentation and create larger pipelines of bankable projects.

Private Investors See Opportunity, But Adaptation Remains Tough

For banks, infrastructure developers, institutional investors and corporations, the climate-finance gap represents a potentially enormous investment market spanning renewable power, electricity networks, sustainable transport, resilient infrastructure, energy efficiency and climate-smart agriculture.

But substantial obstacles remain.

Only around 60% of emerging markets and 8% of developing economies have investment-grade sovereign ratings, according to figures cited in the paper. Currency volatility, shallow domestic capital markets, regulatory uncertainty and inadequate project preparation further restrict cross-border investment.

Adaptation poses an even harder financing challenge because many projects deliver social benefits without generating conventional commercial revenue. Around 40% of publicly identified priority adaptation investments are classified as public goods, while another 35% fall into areas generally provided by governments, including quasi-public goods and essential services.

Flood defences, for example, may prevent enormous economic losses without generating predictable cash flows. Public and concessional financing will therefore remain indispensable.

For policymakers, the report ultimately points toward sequencing rather than a single financial solution. Governments need to strengthen economic fundamentals, establish credible climate policies and develop investable project pipelines. Development partners should concentrate concessional resources where commercial markets cannot operate effectively, while private investors need predictable regulation and appropriately allocated risks.

Closing the climate-finance gap will consequently depend less on inventing another green financial product than on creating an investment ecosystem capable of moving capital at scale. Public money must absorb risks selectively, policy reforms must reduce them structurally, and private finance must increasingly carry commercially viable climate investment. That combination could determine whether developing economies can pursue climate resilience without sacrificing fiscal stability and broader development goals.