Deep dive: Nature-based solutions & ecosystem restoration — what's working, what's not, and what's next

Nature-based solutions (NbS) now attract over $200 billion annually in combined public and private finance, yet fewer than 30% of funded projects demonstrate durable ecological outcomes beyond five years. This paradox sits at the center of the most consequential debate in conservation and climate policy: whether channeling capital toward forests, wetlands, mangroves, and grasslands can deliver measurable carbon sequestration, biodiversity recovery, and community resilience at the scale required to meet Paris Agreement targets. The evidence from the past three years reveals a complex picture of genuine progress, persistent structural failures, and emerging approaches that could fundamentally reshape how restoration is financed, monitored, and governed.

Why It Matters

The Kunming-Montreal Global Biodiversity Framework, adopted in December 2022, commits 196 nations to protecting 30% of land and ocean areas by 2030 and restoring 30% of degraded ecosystems. Meeting these targets requires restoring approximately 1 billion hectares of degraded land globally, an area roughly the size of China. The UN Decade on Ecosystem Restoration (2021 to 2030) has catalyzed national pledges totaling over 230 million hectares of restoration commitments under the Bonn Challenge, but verified completion rates remain below 15% of pledged area.

Financially, the stakes are enormous. The World Economic Forum estimates that $44 trillion of economic value generation, more than half of global GDP, depends moderately or highly on ecosystem services including pollination, water purification, flood regulation, and soil formation. The Paulson Institute's Financing Nature report calculates an annual biodiversity financing gap of $711 billion through 2030, requiring a roughly fourfold increase from current investment levels. Despite this gap, private sector engagement has accelerated rapidly. Voluntary carbon markets channeled $1.9 billion toward NbS credits in 2024, while sovereign green bonds increasingly earmark proceeds for restoration.

For emerging markets, where 70% of global biodiversity resides and ecosystem degradation poses the greatest economic risk, nature-based solutions represent both a climate adaptation imperative and a potential revenue stream. Countries including Brazil, Indonesia, Kenya, and Colombia have developed national NbS strategies that integrate carbon market access, payment for ecosystem services, and community-led restoration into broader development planning.

Key Concepts

Ecosystem Restoration encompasses active interventions to recover degraded, damaged, or destroyed ecosystems. The discipline distinguishes between passive restoration (removing pressures and allowing natural recovery), assisted natural regeneration (facilitating seed dispersal, controlling invasives, and managing hydrology), and active restoration (planting, soil amendment, and engineered interventions). Evidence consistently shows that passive and assisted approaches deliver higher biodiversity outcomes per dollar invested, though active restoration becomes necessary where degradation has crossed ecological thresholds that prevent natural recovery.

Payment for Ecosystem Services (PES) creates economic mechanisms that compensate landowners and communities for maintaining or enhancing ecosystem functions. Well-designed PES programs quantify services such as carbon storage, watershed protection, or habitat provision, then channel payments from beneficiaries (water utilities, governments, or carbon market participants) to stewards. Costa Rica's Pagos por Servicios Ambientales program, operating since 1997, has enrolled over 1.3 million hectares and reversed the country's deforestation trajectory, demonstrating that properly structured incentives can deliver landscape-scale outcomes.

Natural Climate Solutions (NCS) specifically target the carbon sequestration and emissions avoidance potential of ecosystem management. Research published in Proceedings of the National Academy of Sciences estimates that NCS could provide up to 37% of the emissions reductions needed by 2030 to hold warming below 2 degrees Celsius, with forests, agricultural lands, and wetlands offering the largest mitigation potential. However, permanence risk, additionality verification, and leakage remain methodological challenges that high-integrity carbon standards continue to refine.

Landscape-scale Restoration applies restoration principles across entire watersheds, bioregions, or ecological corridors rather than isolated project sites. This approach recognizes that ecosystem functions, particularly hydrological regulation, species migration, and genetic connectivity, operate at scales that individual projects cannot address. The Atlantic Forest Restoration Pact in Brazil exemplifies this model, coordinating over 300 organizations to restore 15 million hectares of one of the world's most biodiverse and fragmented biomes.

NbS Performance Benchmarks by Ecosystem Type

Ecosystem	Carbon Sequestration (tCO2e/ha/yr)	Biodiversity Recovery Timeline	Cost per Hectare (USD)	Permanence Risk
Mangroves	6-12	5-10 years	$3,000-15,000	Low-Medium
Tropical Forest Restoration	8-20	15-30 years	$1,500-5,000	Medium-High
Peatland Rewetting	10-35 (avoided emissions)	5-15 years	$500-3,000	Low
Temperate Grassland	1-3	5-10 years	$200-1,200	Medium
Coral Reef Restoration	N/A	10-25 years	$10,000-400,000	High
Agroforestry Integration	3-8	3-7 years	$500-2,500	Medium
Seagrass Restoration	3-8	5-15 years	$5,000-50,000	Medium-High

What's Working

Mangrove Restoration in Southeast Asia and East Africa

Mangrove restoration has emerged as the highest-confidence NbS investment globally, delivering measurable carbon, biodiversity, and coastal protection outcomes within 5 to 10 years. Indonesia's National Mangrove Restoration Program, targeting 600,000 hectares by 2024, has established over 400,000 hectares using community-based planting and hydrological rehabilitation. Independent monitoring by CIFOR-ICRAF confirms carbon sequestration rates of 6 to 12 tCO2e per hectare annually in restored mangrove stands, with co-benefits including nursery habitat for commercial fisheries that generate $750 to $2,000 per hectare in annual livelihood value. Kenya's Mikoko Pamoja project in Gazi Bay became the world's first community-led mangrove carbon project to issue verified credits under the Plan Vivo standard, distributing revenues directly to village development funds while maintaining 98% seedling survival rates through locally managed monitoring.

Large-Scale Peatland Rewetting in Northern Europe and Indonesia

Peatland rewetting delivers the highest avoided emissions per hectare of any NbS intervention. Drained peatlands occupy less than 3% of global land area but release 5% of anthropogenic CO2 emissions. Germany's National Peatland Strategy has committed 4 billion euros to rewetting 500,000 hectares of degraded peatland, with early implementation sites showing emissions reductions of 15 to 35 tCO2e per hectare annually. Indonesia's Peatland Restoration Agency (BRG) has rewetted over 3.5 million hectares since 2016, contributing to a 75% reduction in peat fire emissions compared to the catastrophic 2015 season. The economics are compelling: rewetting costs $500 to $3,000 per hectare, while the social cost of avoided emissions ranges from $2,500 to $12,000 per hectare at current carbon pricing.

Community-Led Restoration in the African Great Green Wall

The Great Green Wall initiative, stretching 8,000 kilometers across the Sahel from Senegal to Djibouti, represents the most ambitious community-led restoration effort globally. While progress has been uneven across its 11 participating nations, Ethiopia's contribution through its Green Legacy Initiative has planted over 25 billion seedlings since 2019, with survival rates averaging 70% in monitored sites. Senegal's Assisted Natural Regeneration program in the Ferlo region, managed by local pastoral communities, has recovered 5.4 million hectares of degraded Sahelian woodland using farmer-managed natural regeneration (FMNR) techniques that cost as little as $20 per hectare. FMNR leverages existing root systems and seed banks, requiring no nursery infrastructure and generating firewood, fodder, and fruit yields within 3 to 5 years.

What's Not Working

Monoculture Tree Planting Masquerading as Restoration

The single largest threat to NbS credibility is the conflation of commercial tree planting with genuine ecosystem restoration. A 2024 analysis published in Nature Sustainability found that 45% of corporate-funded "restoration" projects planted monoculture or limited-species commercial plantations, primarily eucalyptus and acacia, that deliver minimal biodiversity benefits and face elevated fire, pest, and disease risks. These plantations sequester carbon during initial growth phases but plateau within 10 to 15 years and may actually reduce soil carbon compared to native grassland ecosystems they replace. The Trillion Trees initiative and IUCN Restoration Barometer have responded by tightening definitions to exclude monoculture plantations from restoration metrics, but enforcement remains inconsistent across national reporting frameworks.

Carbon Credit Quality and Integrity Failures

High-profile investigations by The Guardian, Die Zeit, and SourceMaterial in 2023 revealed that major REDD+ forest carbon projects oversold credits by 50 to 90%, generating millions of worthless offsets purchased by corporations for net-zero claims. Verra, the world's largest carbon standard, subsequently overhauled its REDD+ methodology, introducing jurisdictional baselines and satellite-verified deforestation monitoring. However, confidence in NbS carbon credits remains fragile. A 2025 analysis by Sylvera found that only 35% of nature-based carbon credits received the highest quality rating (AAA or AA), with permanence risk and additionality concerns driving most downgrades. The Integrity Council for the Voluntary Carbon Market (ICVCM) Core Carbon Principles, effective from mid-2024, establish minimum quality thresholds, but market-wide compliance remains incomplete.

Insufficient Long-Term Monitoring and Maintenance

Restoration projects typically receive 3 to 5 years of initial funding, yet most ecosystems require 10 to 30 years to achieve functional recovery. A global meta-analysis of 89 restoration projects published in Science found that 40% showed declining ecological condition within 5 years of funding cessation, primarily due to invasive species reinvasion, fire management lapses, and loss of community engagement. The monitoring gap is equally problematic: fewer than 25% of restoration projects report biodiversity outcomes beyond species counts, and standardized metrics for ecosystem function recovery remain poorly adopted outside academic research contexts.

Land Tenure and Community Rights Conflicts

In emerging markets, NbS projects increasingly generate conflicts over land tenure, benefit-sharing, and community consent. Carbon projects in the Congo Basin, Amazon, and Southeast Asia have faced accusations of "carbon colonialism," where international developers secure carbon rights without adequate free, prior, and informed consent from indigenous and local communities. A 2024 Rights and Resources Initiative report documented that only 38% of NbS carbon projects in tropical forest countries included legally binding benefit-sharing agreements with local communities, undermining both social legitimacy and long-term project viability.

What's Next

Technology-Enabled Monitoring at Scale

Remote sensing and AI-powered monitoring are transforming the ability to verify NbS outcomes across millions of hectares. Planet Labs and Maxar now provide weekly satellite imagery at 3 to 5 meter resolution covering all tropical forest areas, enabling near-real-time deforestation detection. Environmental DNA (eDNA) sampling allows biodiversity assessment from water and soil samples without species-level taxonomic expertise, reducing monitoring costs by 60 to 80% compared to traditional survey methods. CTrees, a satellite-based forest carbon monitoring platform developed by NASA-JPL scientists, provides independent verification of carbon stock changes that complement ground-based measurement, narrowing the gap between claimed and actual sequestration. These technologies are converging to create transparent, auditable monitoring systems that could rebuild trust in NbS credit markets.

Biodiversity Credits as a New Revenue Stream

Biodiversity credit markets, distinct from carbon markets, are emerging as a mechanism to directly value ecological outcomes. Australia's Nature Repair Market, operational since January 2024, established the world's first government-regulated biodiversity credit framework, allowing landholders to register projects and sell verified biodiversity certificates. The Wallacea Trust and ValueNature are piloting similar frameworks in the UK and Southeast Asia. While nascent (total transaction volume remained below $100 million in 2024), biodiversity credits could eventually rival carbon markets in scale if regulatory frameworks such as the EU's Corporate Sustainability Reporting Directive (CSRD) begin requiring companies to disclose and address nature-related dependencies and impacts.

Blended Finance Models for Restoration at Scale

Innovative financing structures are bridging the gap between restoration costs and revenue streams. The Land Degradation Neutrality Fund, managed by Mirova, has deployed over $200 million in blended finance across 35 projects in 28 countries, combining concessional capital from development finance institutions with commercial returns from sustainable land use. The LEAF Coalition, backed by governments and corporations, has committed $1.5 billion to jurisdictional REDD+ programs that align national forest protection with high-integrity carbon markets. Meanwhile, restoration bonds pioneered by Permian Global and South Pole allow institutional investors to gain exposure to NbS outcomes through fixed-income structures with risk-adjusted returns of 5 to 8% annually.

Action Checklist

• Assess organizational nature-related dependencies and impacts using the TNFD LEAP framework before selecting NbS investments
• Prioritize NbS projects with community co-governance structures and legally binding benefit-sharing agreements
• Require satellite-verified monitoring data and independent third-party validation for all NbS carbon credits
• Evaluate project permanence mechanisms including buffer pools, insurance products, and long-term stewardship funding
• Diversify NbS portfolio across ecosystem types and geographies to manage permanence and political risk
• Integrate biodiversity metrics (species richness, functional diversity, ecosystem integrity indices) alongside carbon accounting
• Establish minimum 10-year monitoring commitments with standardized ecological outcome reporting
• Engage with emerging biodiversity credit frameworks as complementary revenue streams to carbon markets

FAQ

Q: What is the most cost-effective nature-based solution for carbon sequestration? A: Peatland rewetting and avoided peatland drainage deliver the highest carbon returns per dollar invested, with avoided emissions of 15 to 35 tCO2e per hectare annually at costs of $500 to $3,000 per hectare. Farmer-managed natural regeneration in dryland Africa represents the lowest absolute cost intervention at $20 to $100 per hectare, though sequestration rates are lower (1 to 3 tCO2e per hectare annually). Mangrove restoration occupies a middle ground with high sequestration rates (6 to 12 tCO2e per hectare) and substantial co-benefits, but higher implementation costs ($3,000 to $15,000 per hectare) due to coastal site complexity.

Q: How can investors distinguish high-quality NbS projects from greenwashing? A: Look for projects with ICVCM Core Carbon Principles compliance, independent third-party verification (Sylvera, BeZero, or Calyx Global ratings of A or above), satellite-based monitoring data, legally documented community consent and benefit-sharing, ecological baselines predating project initiation, and buffer pool allocations of at least 15 to 20% for permanence risk. Avoid projects that rely solely on tree count metrics without measuring ecosystem function, lack community engagement documentation, or use proprietary methodologies without peer-reviewed validation.

Q: What role do indigenous and local communities play in NbS effectiveness? A: Research consistently demonstrates that indigenous-managed territories experience deforestation rates 50% lower than equivalent unmanaged areas, and community-led restoration projects show 20 to 30% higher long-term survival rates than externally managed interventions. Effective NbS programs integrate traditional ecological knowledge, provide direct financial benefits through PES or employment, and establish community governance structures with decision-making authority over project design and implementation. Projects that bypass community engagement face significantly higher reversal risk and lower ecological outcomes.

Q: Are nature-based carbon credits viable for corporate net-zero claims? A: Yes, when sourced from high-integrity projects that meet ICVCM Core Carbon Principles and are used alongside, not instead of, direct emissions reductions within an organization's value chain. The Science Based Targets initiative (SBTi) requires companies to reduce at least 90% of scope 1 and 2 emissions through direct abatement before using NbS credits to neutralize residual emissions. Credits should be treated as "beyond value chain mitigation" rather than offsets, and organizations should budget $15 to $50 per tonne for high-quality NbS credits, significantly above the voluntary market average of $6 to $8 per tonne that typically reflects lower-quality supply.

Q: What are the biggest risks facing NbS investments over the next decade? A: Climate change itself poses the largest systemic risk, with rising temperatures, shifting precipitation patterns, and increased wildfire frequency threatening the permanence of restored ecosystems. Political and governance risks include land tenure disputes, policy reversals, and regulatory uncertainty in carbon markets. Market risks include oversupply of low-quality credits depressing prices and reducing incentives for high-integrity projects. Organizations should diversify across ecosystem types, geographies, and financing structures, and incorporate climate scenario analysis into NbS portfolio planning.

Sources

• Griscom, B. W., et al. (2017). Natural climate solutions. Proceedings of the National Academy of Sciences, 114(44), 11645-11650.
• Paulson Institute, The Nature Conservancy, and Cornell Atkinson Center. (2025). Financing Nature: Closing the Global Biodiversity Financing Gap, 2025 Update. Chicago: Paulson Institute.
• West, T. A. P., et al. (2023). Action needed to make carbon offsets from tropical forest conservation work for climate change mitigation. Science, 381(6660), 873-877.
• IUCN. (2024). Global Standard for Nature-based Solutions: Implementation Guide. Gland: International Union for Conservation of Nature.
• Sylvera. (2025). State of Carbon Credits: Nature-Based Solutions Quality Assessment, Annual Report. London: Sylvera Ltd.
• CIFOR-ICRAF. (2024). Mangrove Restoration Monitoring and Outcomes: Synthesis of Southeast Asian and East African Programs. Bogor: Center for International Forestry Research.
• Rights and Resources Initiative. (2024). Who Owns the Carbon? Community Rights and Benefit-Sharing in Nature-Based Carbon Projects. Washington, DC: RRI.
• Strassburg, B. B. N., et al. (2020). Global priority areas for ecosystem restoration. Nature, 586, 724-729.