Financing Integrity: The Missing Middle in Nature-Based Carbon

Voluntary carbon markets have spent years refining supply-side and demand-side integrity. Both are essential – but neither guarantees that projects can be built, survive shocks, or scale. 

What’s missing is financing integrity: whether capital is structured to let high integrity projects happen, especially for smaller or community-led developers. Even best methodologies and the most committed buyers cannot deliver impact if projects cannot access viable, long-term finance. 

Evolution of Carbon Finance 

In the early years, many projects were funded directly from corporate social responsibility and development agencies using small budgets to back pilot initiatives. Ticket sizes were modest, relationships personal, and risk allocation informal.  

As corporate climate strategies and net zero pledges expanded, demand shifted toward larger, multiyear positions from big corporates and, more recently, technology and finance players looking at carbon as part of broader transition plans. Today’s offtakers prioritise reputational and accounting risk alongside price. 

On the financing side, early projects often relied on buyers for quasi-equity or soft loans. Forward offtake agreements later allowed developers pre-sell future credits and use that as quasi-project finance. As integrity standards tightened, including dynamic baselines and shorter baseline validity periods, forward revenue became less predictable. Integrity risk turned into financial risk. Developers faced higher scrutiny, more volatility, and rising costs – without a matching evolution in financing tools.  

Structured and blended finance is emerging. Layered capital stacks may combine concessional first loss tranches from philanthropic or public funds, senior debt from banks, and equity from impact or infrastructure investors. Mechanisms like revenue share agreements, mezzanine loans, and guarantees aim to absorb initial losses and crowd in more conservative capital as projects mature. These models concentrate control and returns with investors while leaving local partners with thin economics and heavy obligations. High integrity on paper does not always translate into durable, inclusive projects on the ground. 

The Ticket Size Trap 

Most institutional investors and specialised funds have minimum cheque sizes (ranging from $5-50 million) to justify legal, tax, and diligence costs of complex transactions. This naturally pushes towards: 

• Larger platforms and aggregated vehicles 

• Fewer, bigger deals where the cost of structuring can be spread over more capital 

But many high-impact nature-based projects do not start at that scale. Early-stage initiatives – particularly those led by local actors, communities or indigenous organisations require less than minimum thresholds.  

The result is a structural mismatch: 

• Smaller, local projects are effectively “too small to finance” under current models, even when they demonstrate high integrity and high impact 

• To access capital, projects can be pushed into aggregation structures where decision-making and economics migrate away from local stakeholders 

Financing integrity must grapple with this reality: if only large tickets are financeable, only large actors will shape the market. 

Offtakers vs. Investors: A Growing Gap 

A related tension is now emerging between offtakers and financiers. 

• Offtakers prioritise reputational, accounting, and delivery risk with strict evidence thresholds, strong delivery guarantees, and pay-on-delivery structures 

• Investors optimise for bankable cash flows and risk-adjusted returns. They want clear demand and pricing, but also structures they can lend against without dumping all risk onto a thinly capitalised project SPV 

The result: contracts often derisk offtakers but not developers. Smaller, high impact, community or indigenous-led projects are squeezed out or pushed into heavily diluted positions. 

What Financing Integrity Should Look Like 

Reconnecting integrity and finance require deliberate design choices: 

• Financeable offtake: Forward contracts acknowledging realistic delivery risk, using volume bands, and providing step-in or restructuring mechanisms so banks and funds can underwrite them 

• Risk sharing, not risk dumping: Sharing buffers, portfolio-level insurance, and partial guarantees so buyers, financiers, and developers all carry some downside 

• Tiered requirements: Different expectations for billion-dollar platforms versus smallholder or community-anchored projects, especially on guarantees and balance-sheet strength 

• Blended structures: Pairing advanced market commitments with concessional or first-loss capital so “we will buy if you deliver” translates into money that helps projects reach delivery 

These shifts do not weaken integrity. They translate it into something financeable and more inclusive. 

From Gatekeeping to Enabling 

At the same time, a “war of diligence” – ever thicker documentation, overlapping frameworks, and bespoke requirements – risks filtering for those with the strongest balance sheets and best lawyers. Smaller developers face more cost, more complexity, and less visibility on price and demand.  

The next evolution is smarter rigor: transparent, consistent, and scalable diligence aligned with financeable offtake and fair risk-sharing. That’s how supply-side, demand-side, and financing integrity can reinforce one another and help nature-based carbon move from a curated niche to a durable, scalable part of climate finance. 

Disclaimer: The views expressed are the authors’ own and do not represent those of any organisation.