A conservation success that is running on thin budgets
Brazil has built one of the world’s largest protected-area networks. Yet a new study in the journal Environmental Conservation shows that financing has not kept pace with legal expansion. The paper, led by Helenilza Ferreira Albuquerque Cunha, examined funding for 300 federal protected areas managed by ICMBio, covering close to 750,000 square kilometres across the Amazon, savannas and Atlantic Forest.
The authors compared actual expenditure with evidence-based estimates of the minimum recurring cost needed to manage each site. These costs include staff, enforcement, fire response, monitoring and community engagement. In 2023, 72% of the protected areas in the sample were underfunded. Their combined shortfall was about US$958 million in purchasing-power terms. Over the decade from 2014 to 2023, total investment in the system rose by roughly 30%. But this increase lagged far behind the growth in Brazil’s conservation estate and the real cost of managing it.
The gap is most acute in the Amazon biome, where management costs are structurally higher. Many reserves are huge, remote, and accessible only by long river journeys or small aircraft. The study found that Amazonian protected areas had an average funding deficit of 79.2% in 2023. They received only about one-fifth of the level identified as the minimum required. Of the 122 Amazon sites in the sample, 120 fell below those minimum cost thresholds.
This is not only a question of ecological ambition. Underfunding reduces the capacity for routine patrols. It slows responses to illegal mining, logging and land grabbing. It weakens fire management just as climate change and land-use pressures intensify. For investors, this translates into execution risk for Brazil’s environmental pledges and for climate-linked portfolios that assume protected areas will keep storing carbon and buffering hydrological regimes.
Visibility, geography and the opportunity for durable finance
The Cunha study also explores why some reserves fare better than others within the same federal system. Larger units tend to show larger funding gaps, reflecting higher fixed costs for transport, fuel, equipment and basic presence on the ground. Older protected areas, by contrast, show somewhat smaller shortfalls. The authors link this to more mature administrative routines and stronger political support.
One of the more striking findings concerns population density. The team expected areas with more people nearby to have higher costs and therefore larger deficits. Instead, protected areas closer to cities and institutions tended to have smaller gaps. Visibility appears to matter. Parks near urban centres are easier for citizens, media and civil society to visit and advocate for. They are also easier for officials to defend during budget negotiations.
Remote Amazon reserves often hold some of Brazil’s greatest stores of natural capital, including carbon, biodiversity and water resources. Yet they sit far from voters, newsrooms and local tax bases. They struggle to attract stable funding. This creates a lopsided geography of conservation finance: the parks that matter most for global climate and biodiversity goals are frequently those with the weakest cash flow.
Brazil does have important instruments in place. Programmes such as ARPA (the Amazon Region Protected Areas programme) and the Amazon Fund, alongside rising federal environmental budgets under the current administration, already help support management in priority areas. Tourism has also generated incremental revenue in some more accessible reserves. However, these mechanisms do not yet close the structural Amazon funding gap highlighted by the new research.
For investors and development finance institutions, this gap looks increasingly like a pipeline. Stable, transparent and long-term finance for protection units would turn legal designations into operational conservation assets. That suggests room for blended vehicles combining public budgets, concessional capital and private flows. These could include results-based climate finance, green bonds tied to management performance, and structured funds aligned with Brazil’s nature and transition strategies.
The study’s message is straightforward: Brazil has already done much of the hard political work by protecting large swathes of the Amazon on paper. The next phase is financial. Investors should watch for moves to scale up ARPA-style endowments, expand the Amazon Fund, and pilot new conservation-finance instruments that can turn today’s Amazon funding gap into tomorrow’s contracted cash flows.
