Nature recovery needs more than ambition. To attract long-term participation and finance, ecological outcomes must be measurable, comparable and capable of independent scrutiny.

In 2024, Napital joined with AECOM to publish The Natural Capital Manifesto, setting out the strategic case for treating nature recovery with the same investment discipline as other forms of infrastructure. The newly released Natural Capital Index White Paper takes the next step: it explains how that vision can be implemented in practice.

Natural Capital Index

The Natural Capital Index (NCi) is a verified ecological performance metric conceived and driven forward by Napital, with AECOM serving as technical lead and CMA Testing providing independent verification.

The NCi translates complex restoration outcomes into a consistent and auditable set of performance data. It is designed to be scientifically defensible, understandable to decision-makers and suitable for independent review—providing the measurement layer through which natural capital can become more credible and investable.

The NCi assesses ecological recovery across five connected performance domains:

• Biodiversity
• Carbon Storage
• Air Quality Regulation
• Water Regulation
• Soil Quality Regulation

Each domain is measured independently, allowing project teams, ecologists and verifiers to identify where recovery is progressing and where further intervention may be required. At the more advanced assessment tiers, the five normalised scores can also be combined into a Composite NCi Score for headline reporting and year-on-year tracking.

A Tiered Model for Practical Adoption

A central feature of the NCi is its tiered assessment model. Comprehensive ecological assessment requires substantial field data, including habitat and vegetation surveys, soil sampling, environmental DNA (eDNA) analysis and bioacoustic monitoring. However, the availability of this data—and the reference infrastructure needed to interpret it—varies considerably between locations and projects.

Tier 1 — Foundational

• Tier 1 establishes the five core performance domains using accessible, independently auditable measurements reported in their physical units. At this tier, the five metrics are reported separately and are not combined into a Composite NCi Score.

Tier 1+ — Standard

• Tier 1+ applies the NCi normalisation framework to the five metrics, converting them into comparable
  performance scores on a 0-to-1 scale. These scores are then combined using a geometric mean to generate the Composite NCi Score. Tier 1+ is the minimum level at which a verified Composite NCi Score can be issued.

Tier 2 — Comprehensive

• Tier 2 represents the full NCi methodology. It builds on Tier 1+ by adding more comprehensive biodiversity evidence, including soil biota community composition assessed through eDNA and faunal species diversity assessed through bioacoustics.

This tiered approach allows projects to begin with the data they can reliably collect to day and progress towards a more comprehensive assessment as monitoring capacity, reference data and technical infrastructure develop. Data collected at an earlier tier remains compatible with the later stages, creating a clear and credible pathway for methodological advancement.

From Methodology to Application

The white paper sets out the NCi methodology in full, covering its conceptual architecture, scientific basis, data collection requirements, analytical methods, normalisation, monitoring and independent verification.

The Pulau Bintan projectin Indonesia is included as the first worked example, demonstrating how the methodology can be applied while transparently documenting the constraints and adaptations encountered during a real pilot.

Beyond Bintan, Napital has also applied the NCi to its Taoyuan regenerative farming project and Linkou urban natural capital project in Taiwan. These applications demonstrate how the framework can be used across different landscape contexts, from tropical forest restoration to agriculture and urban-nature integration.

Making Nature Recovery Measurable

The NCi is designed as a living methodology—one that can evolve as ecological science, field data, monitoring technologies and regional reference datasets improve.

Its tiered model makes that evolution practical. Projects do not need to wait for perfect data before taking credible action, but they must clearly disclose the scope, evidence and limitations of the assessment tier being used.

By connecting ecological science, Nature-based Solutions, digital monitoring and independent verification, the NCi provides a practical framework for project design, adaptive management, sustainability reporting and the development of finance-ready natural capital opportunities.

The NCi makes nature recovery measurable. The white paper makes the methodology open to scrutiny, learning and continued improvement.

We welcome feedback, regional adaptations and collaboration with project owners, technical specialists, businesses, financial institutions and research partners.