as an asset class

Natural capital is moving into mainstream portfolios. The key is to look beyond the environmental label and understand the economics, risks and role of each investment.

Natural capital is steadily moving onto the institutional investment agenda. Forestry has been part of pension fund, endowment and other long-term portfolios for decades, with agriculture following a similar path. More recently, restoration, carbon, biodiversity and other ecosystem services have broadened the opportunity set.

Yet a basic question remains: what exactly is natural capital as an investment, and what role should it play in a portfolio?

The answer starts with a simple principle: investors should focus first on the underlying economics, not the environmental label.

Natural capital is not a single asset class

A mature commercial forest in the UK, a eucalyptus plantation in Brazil and a restoration project generating carbon credits may all sit under the natural-capital umbrella. Economically, however, they are very different investments.

They have different return drivers, risk exposures, cash-flow profiles and levels of liquidity. Established forestry in developed markets may offer defensive real-asset characteristics. Highly productive emerging markets may provide greater return potential, but add currency, country, operational and market risks. Restoration and environmental strategies may offer further upside, while depending more heavily on developing carbon or biodiversity markets.

For that reason, there is no single expected return for natural capital. It is more useful to place opportunities on a spectrum—from core and core-plus through value-add to opportunistic—and ask whether the expected return adequately compensates for the specific risks being taken.

Start by identifying the source of return

One of the first questions I ask when assessing a forestry investment is: where does the return actually come from?

Part of the answer is biological growth. Trees grow whether financial markets are rising or falling. As they grow, timber volume increases and the wood may move into higher-value product categories. Part of the investment return is therefore literally growing on the land.

But biological growth is only one component. Returns may also come from timber sales, land appreciation, improved forest management, timber-price movements and, increasingly, carbon or other environmental revenues.

This distinction matters because two investments can show the same expected internal rate of return while carrying very different risks. A strategy driven mainly by biological growth and relatively predictable timber sales is not equivalent to one that depends heavily on future carbon prices, aggressive land appreciation or a high exit valuation.

The headline return shows how attractive a model appears. The composition of that return reveals much more about the investment itself.

Investors should also establish whether projected returns are expressed in real or nominal terms. Forests are long-duration assets, and modest inflation assumptions can create significant differences when compounded over 10, 20 or 30 years.

Forestry can provide income and capital growth

Forestry can generate both income and capital appreciation, although the balance depends on the type and maturity of the asset.

Income may come from harvesting and thinning, as well as land leases, hunting rights, carbon and other activities. Capital appreciation may come from biological growth, improved timber quality, land values, better management or changing market conditions.

The result is a wide range of investment profiles. A mature forest with regular harvesting may provide relatively predictable distributions. A young plantation may produce little income for several years while biological value accumulates.

This becomes especially important in portfolio construction. A strong forestry portfolio should not simply contain a collection of attractive assets; it should combine age classes, harvesting schedules and cash-flow profiles that complement one another.

Inflation sensitivity and diversification

Forestry is often described as an inflation hedge. There is logic behind that description, but the reality is more nuanced.

Forests are real assets that produce physical commodities. Over long periods, timber prices, land values and operating costs interact with inflation, which can provide useful inflation sensitivity. But timber prices do not automatically rise whenever inflation increases. Local supply and demand, construction activity, pulp markets, processing capacity and currencies all influence what a particular forest can earn.

It is therefore more accurate to view forestry as a potential source of long-term inflation sensitivity than as a guaranteed short-term inflation hedge.

Diversification may be an equally important characteristic. Biological growth behaves differently from most traditional financial return drivers. Trees continue growing through elections, interest-rate cycles and stock-market corrections, even though timber prices, valuations and currencies remain connected to the wider economy.

There is also diversification within forestry itself. Portfolios can combine geographies, species, age classes, currencies, timber markets and end uses. A well-constructed allocation can therefore diversify both within natural capital and across the investor’s broader portfolio.

Illiquidity is a cost—and investors should be paid for it

Natural capital is generally illiquid. A forest cannot be sold tomorrow morning at the click of a button; transactions require technical and legal due diligence, valuation, negotiation and time.

The relevant question is not whether forestry is illiquid, but whether the expected return adequately compensates the investor for accepting that illiquidity. A high-quality forest bought at an excessive valuation may still offer an insufficient premium.

Forestry shares characteristics with other real assets. Like real estate, it involves land, local markets and active management. Like infrastructure, it can involve long-duration investment, relatively predictable production and specialist operational expertise.

It also has a distinctive feature: harvest flexibility. When biological and market conditions allow, a manager may accelerate or postpone harvesting in response to timber prices, portfolio cash requirements and forest conditions.

Where should natural capital sit in a portfolio?

Institutional investors often ask whether natural capital belongs in real assets, infrastructure, real estate, alternatives or impact. My answer is pragmatic: place it where the institution can evaluate it properly.

The organisational label matters less than having the expertise and framework to assess return drivers, operational risks, valuation, liquidity and environmental outcomes. Over time, deeper performance data, stronger benchmarks, greater standardisation and more developed secondary markets may support natural capital as an allocation category in its own right.

There is no universally appropriate allocation size. The answer depends on liquidity requirements, risk tolerance, return objectives, investment horizon, existing real-asset exposure, internal expertise and environmental goals.

For first-time investors, a measured initial allocation may be more sensible than trying to build the final portfolio immediately. An initial commitment allows the institution to learn about managers, geographies, investment models and risks before allocating significantly more capital.

Build a portfolio, not a collection of projects

As an allocation develops, it should become more diversified—but diversification should serve the investment objective rather than become an objective in itself.

A mature natural-capital portfolio might combine established forestry, higher-growth forestry, agriculture, secondaries, restoration and carbon-enhanced strategies across several regions and structures. The aim is to combine sources of return, risk, duration and cash flow in a way that supports the investor’s wider portfolio.

Investment structures should be selected on the same basis. Funds can offer diversification and specialist management. Separately managed accounts can provide greater control and customisation. Direct investments offer transparency and governance but require more internal expertise. Co-investments provide targeted exposure, while secondaries may offer access to more mature assets and earlier cash flows.

The investment structure should follow the investment objective—not the other way around.

Five questions for investment committees

Before committing capital, institutional investors should be able to answer five familiar questions:

• Does the investment offer an attractive risk-adjusted return?

• Where does that return come from, and how dependent is it on unproven markets or optimistic exit assumptions?

• Does the investment diversify exposures already held elsewhere in the portfolio?

• Are the liquidity, operational, market, country and currency risks understandable and manageable?

• Can it deliver measurable environmental outcomes alongside financial performance?

Natural capital still needs to earn its place

Natural capital should not receive an institutional allocation simply because it is natural, sustainable or environmentally desirable. It has to earn its place in the portfolio in the same way as any other investment.

The strongest long-term case is not that investors should accept weaker financial characteristics in exchange for environmental benefits. It is that, in the right assets and at the right price, financial value and natural value can reinforce one another.

When investors view natural capital through that lens, it stops being primarily an environmental allocation and becomes something more compelling: an investment allocation in its own right.

Natural Capital as an Asset Class:

What Institutional Investors Need to Know

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Nature & Capital is the investment advisory arm of Nature & Group

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Nature & Capital works with selected specialist investment managers across forestry, natural capital and related real-asset strategies. Any information concerning specific funds, investment vehicles or opportunities is provided for general informational purposes only and does not constitute an offer, solicitation, recommendation or invitation to invest, nor investment, legal, tax or other professional advice. Information on specific investment opportunities may be made available only to eligible professional, institutional, accredited or otherwise qualified investors, as applicable, and subject to the relevant securities laws, regulatory requirements and jurisdictional restrictions. No investment opportunity is offered or made available in any jurisdiction where such offer, solicitation or distribution would be unlawful or would require Nature & Capital or any relevant investment manager to obtain a licence, registration or authorisation that has not been obtained. Prospective investors should conduct their own independent assessment and obtain appropriate professional advice before making any investment decision. Past performance, target returns and forward-looking statements, where referenced, are not guarantees of future results.