Can fungi save the planet from climate change?

Fungi are neither plants nor animals, yet they quietly run much of the planet’s biological bookkeeping: cycling nutrients, knitting together roots, and breaking down the hard stuff that other organisms leave behind.

This article takes a long look at what fungi can and cannot do for the climate crisis, exploring the science, the promising technologies, and the real-world constraints that determine whether fungal solutions will be a curious sidelight or a major tool in our toolbox.

Why fungi deserve attention

Fungi occupy a unique ecological niche: they are the planet’s primary decomposers and symbionts, able to transform complex organic matter and form intimate partnerships with plants.

Mycorrhizal fungi attach to plant roots and exchange nutrients for sugars, while saprotrophic fungi dismantle lignin and cellulose that stump bacteria, releasing and stabilizing carbon along the way.

Because these processes feed directly into how carbon is stored and released in soils and forests, fungal ecology touches the heart of climate dynamics in ecosystems around the world.

How fungi participate in the carbon cycle

At a basic level, fungi influence carbon pools through three pathways: they help plants capture carbon via photosynthesis, they either store carbon in durable forms, and they break down organic matter, returning carbon to the atmosphere.

The balance among these roles varies by species, ecosystem, and management, producing outcomes that can either slow or accelerate greenhouse gas concentrations.

Mycorrhizal networks and plant carbon

Mycorrhizal fungi form two dominant partnerships: arbuscular mycorrhizae (AM) that associate with many grasses and crops, and ectomycorrhizae (ECM) that are common in many temperate and boreal trees.

These networks shuttle nutrients and sometimes carbon between plants. Research suggests ecosystems dominated by ECM fungi often build larger pools of soil carbon than those dominated by AM fungi, though the reasons are complex and context-dependent.

ECM fungi can slow decomposition of certain organic matter by producing enzymes and physical structures that make plant litter less accessible to other decomposers, helping soils accumulate carbon—especially in colder, nutrient-poor forests.

Fungal biomass and durable carbon

Fungal mycelium and the structures they produce—spores, rhizomorphs, and melanized cell walls—represent a portion of soil organic matter that can be relatively persistent.

Some fungi create melanized, recalcitrant compounds that resist microbial attack and can persist in soils for years to decades, providing a modest but meaningful reservoir for carbon.

However, translating fungal biomass into long-term carbon storage depends on environmental conditions: disturbance, land management, and soil chemistry all determine whether that carbon stays put.

Decomposition: both friend and foe

White-rot and brown-rot fungi are essential for breaking down woody material and recycling nutrients, but decomposition also returns carbon to the atmosphere as CO2.

White-rot fungi can even mineralize lignin, a major source of long-lived carbon in wood; when decomposition accelerates, stored carbon is released faster, potentially counteracting sequestration gains elsewhere.

The interplay between fungal decomposition and carbon storage is therefore a balancing act: fungi can lock carbon in some forms while freeing it in others, and their net effect varies with ecosystem type and climate.

Fungal technologies already in play

Beyond ecosystem functions, engineers and entrepreneurs have begun harnessing fungi for materials, cleanup, and agriculture—applications that may reduce emissions indirectly or directly store carbon.

These innovations range from mycelium-based packaging and insulation to fungal remediation of polluted soils and water. Each approach brings promise and limits that deserve careful scrutiny.

Mycelium-based materials

Mycelium—fungal threads grown on agricultural waste—can be pressed into foams, bricks, or leather-like sheets that replace petroleum-based plastics, polystyrene, or animal leather.

Companies such as Ecovative and MycoWorks have scaled prototypes into commercial products, and life cycle analyses suggest lower embodied carbon than many conventional materials, especially when local feedstocks are used.

Scaling these industries reduces demand for fossil-derived goods and for some animal products, which in turn lowers emissions from manufacturing and land use if done responsibly.

Mycoremediation and pollutant breakdown

Certain fungi produce enzymes capable of degrading persistent pollutants: polycyclic aromatic hydrocarbons, petroleum compounds, and some plastics are susceptible to fungal attack under suitable conditions.

Field cases include fungal-based cleanup of diesel-contaminated soil and constructed mycofilters for agricultural runoff. While promising, these applications often need careful site-specific engineering and monitoring.

Remediation can reduce the environmental burden of pollution and restore carbon-cycling processes, but it rarely produces direct, long-term carbon sequestration comparable to forests or soils.

Fungal feedstocks for bio-based manufacturing

Fungi can be cultivated as feedstocks for enzymes, building blocks, and specialty chemicals that replace higher-carbon alternatives in industry.

For example, fungal fermentation produces enzymes used in detergent and biofuel production, and fungal-derived compounds can serve as renewable polymer precursors with lower lifecycle emissions.

The energy and substrate inputs for these processes matter: if substrates are agricultural residues and the facilities run on clean energy, the climate benefit is stronger.

Fungi in agriculture and soil management

Agriculture is where fungal interventions may be most scalable and immediate: improving soil health with fungal inoculants can boost yield, reduce fertilizer use, and change carbon balances.

Arbuscular mycorrhizal fungi (AMF) are particularly relevant here, helping crops access phosphorus and sometimes nitrogen, which can reduce reliance on synthetic fertilizers tied to large CO2 emissions in manufacturing.

Reducing fertilizer and nitrous oxide emissions

Synthetic fertilizer production is energy-intensive and the downstream application can produce nitrous oxide, a greenhouse gas much more potent than CO2.

Fungal associations that improve nutrient uptake can allow farmers to apply less fertilizer without sacrificing yields, thereby cutting both CO2 from production and N2O emissions from fields.

However, the effectiveness of inoculants depends on soil conditions, existing microbial communities, and cropping systems, so generalized claims should be treated cautiously.

Cover crops, crop rotations, and fungal health

Management practices that maintain continuous cover and diverse rotations favor richer fungal communities and build soil organic matter over time.

Integrating mycorrhizal-friendly crops into rotations and reducing tillage help mycelial networks persist, leading to improved soil structure and higher carbon retention in the upper soil layers.

These changes are often low-tech and economically sensible for farmers, but they require knowledge transfer, incentives, and time to scale across agricultural landscapes.

Case studies and real-world examples

Practical deployments illustrate both the potential and the pitfalls of fungal climate strategies, from small pilot projects to emerging industries.

These cases make abstract ecological mechanisms concrete and show how local context shapes outcomes in surprising ways.

Mycelium packaging replacing polystyrene

A packaging manufacturer partnered with farms to turn corn-husks and hemp waste into a growth medium for mycelium. The resulting blocks, molded around shapes and then heat-killed, replaced polystyrene foam for shipping delicate goods.

Lifecycle assessments showed lower embodied carbon and reduced landfill persistence, while farmers gained a new revenue stream for agricultural residues that would otherwise be burned or tilled under.

Yet the business depends on reliable feedstock supply, consistent material properties, and consumer acceptance—each a nontrivial operational barrier.

Forest management and fungal-driven carbon storage

In northern temperate forests, research has linked ECM-dominant stands to larger soil carbon pools, motivating management that favors old-growth characteristics and reduced disturbance.

Some restoration projects explicitly aim to conserve ECM-associated trees and reduce logging to maintain fungal-mediated carbon storage, at least over decadal timescales.

But protecting these carbon reservoirs conflicts with other land uses, and permanence is threatened by warming, insect outbreaks, and extreme fire regimes.

Mycoremediation after industrial spills

Community groups and remediation firms have used fungal beds and inoculation to accelerate the breakdown of hydrocarbon pollutants at small spill sites, with measurable reductions in contaminant concentrations over months.

These projects often combine fungi with engineered soil amendments, aeration, and planting to restore ecological function and prevent contaminant spread into waterways.

While not a silver bullet, such interventions can be cheaper and more ecologically benign than some chemical treatments, particularly in sensitive habitats.

Quantifying the climate potential of fungal interventions

If we want to know whether fungi can “save” the planet from climate change, we need to move from anecdotes to numbers: how much carbon can fungal strategies realistically remove or avoid?

Current estimates vary widely, and the science is still young. Broadly speaking, fungal contributions are more plausible as parts of integrated solutions rather than sole saviors.

Soil carbon sequestration rates

Soil sequestration driven by better fungal management (reduced tillage, cover crops, reforestation, and conservation) might yield a few tons of CO2-equivalent per hectare per year in actively improved systems.

Scaling such practices across millions of hectares could add up, but permanence is uncertain; climate-driven disturbances and land-use change can reverse those gains.

Moreover, separating fungal-driven sequestration from other soil-building practices is challenging in field studies, complicating precise attribution.

Material substitution and avoided emissions

Replacing high-carbon materials with mycelium-based alternatives may avoid emissions associated with fossil-derived plastics and intensive livestock systems, measured as avoided emissions rather than direct carbon removal.

These avoided-emission pathways can be powerful when combined with circular material strategies and renewable energy, but they do not increase the global carbon sink the way forestation or soil sequestration would.

Thus, fungal materials are part of emissions reduction portfolios but not direct atmospheric CO2 removers at planetary scale.

Risks, limitations, and ecological trade-offs

No single technology or organism will fix climate change on its own, and fungi bring specific constraints and potential unintended consequences to any scaling effort.

Understanding these risks is critical to designing interventions that are effective, equitable, and ecologically sound.

Reversibility and permanence

Soils can lose sequestered carbon quickly if disturbed by plowing, erosion, or fire, making permanence a central concern for any soil-focused strategy.

Fungal carbon pools are not immune: shifts in decomposition rates under warming could mobilize previously stable fungal-bound carbon, returning it to the atmosphere.

Therefore, expectations for fungal-driven sequestration must be tempered by the likelihood of reversals in a warming world.

Scale and resource competition

Producing mycelium materials at global scale requires significant feedstock—agricultural residues, wood chips, or dedicated biomass—which competes with other uses like animal feed, soil amendment, or habitat retention.

Mobilizing these resources without creating new environmental harms requires careful supply-chain planning and local ecological assessments.

Similarly, fungal inoculants and engineered strains introduced into soils could alter native microbial communities if not vetted and managed responsibly.

Unintended ecological effects

Introducing nonnative fungal species or strains can disrupt local symbioses and outcompete native fungi, with cascading effects on plant communities and nutrient cycles.

Any large-scale intervention that modifies fungal communities should be preceded by ecological risk assessments and long-term monitoring to detect surprises early.

Responsible development prioritizes native or well-understood species, containment strategies, and adaptive management plans to minimize harm.

Policy, research, and market actions needed

Scaling fungal solutions from laboratory curiosity to climate tool requires coordinated policy signals, targeted research, and market structures that reward verified benefits.

Without these enabling conditions, many promising ideas will stall or produce perverse outcomes.

Key priorities include:

• Robust, long-term field trials to quantify carbon outcomes of fungal interventions across soils and climates.
• Standards and verification protocols for mycelium-based materials and fungal soil carbon credits to ensure claims are credible.
• Support for supply chains that use waste feedstocks while avoiding land-use competition and biodiversity loss.
• Funding for ecological risk assessments when considering fungal introductions or engineered strains.
• Incentives for farmers and land managers to adopt fungal-friendly practices through payments for ecosystem services or technical assistance.

What researchers still need to answer

Open questions are plentiful: which fungal taxa most reliably increase persistent soil carbon, under what climates and soils, and how do interactive stressors like drought or fire alter outcomes?

We also lack consensus on the best metrics and experimental designs to separate fungal effects from other management actions in real-world landscapes.

Addressing these gaps will require interdisciplinary teams combining mycology, soil science, ecology, agronomy, and social sciences to bridge lab findings to practice.

A table: comparing fungal climate strategies

What individuals, communities, and managers can do now

Not every solution requires a lab or a venture fund. Many fungal benefits are unlocked through changes that farmers, gardeners, and land managers can adopt today.

Practical steps include reducing tillage, using cover crops, maintaining diverse rotations, and protecting old trees and undisturbed soils that host rich fungal communities.

Other actionable ideas:

1. Support local producers of mycelium materials and learn about their supply chains before buying.
2. Participate in citizen science projects monitoring fungi or soil health to build regional data.
3. Advocate for policies that fund soil-building programs and ecological restoration at scale.
4. Choose landscape practices that protect fungal diversity, such as leaving woody debris and minimizing chemical overuse.

Personal experience: a small fungal experiment

In my own garden I swapped a conventional, deep-plow bed for a no-till, wood-chip–mounded bed inoculated with locally sourced mycorrhizal inoculum and left it to recover for three seasons.

Within a year the soil structure improved visibly: more crumbly topsoil, fewer water puddles after rains, and healthier root systems on annuals. Plant yields stabilized without increasing fertilizer inputs.

This small experiment underscored that fungal-friendly practices are often low-cost and primarily require patience and local ecological knowledge rather than exotic technology.

How fungi fit into a larger climate strategy

Fungi are neither a silver bullet nor a sideshow: they are part of a portfolio of solutions that includes decarbonizing energy, protecting and restoring ecosystems, and transforming production systems.

When combined with avoided emissions, renewable energy, and land stewardship, fungal approaches can multiply benefits—improving soil health, biodiversity, and local resilience while contributing to emissions reductions.

But placing unrealistic expectations on fungi alone risks diverting attention from the larger transformations that science shows are essential to limit warming.

Final thoughts on potential and prudence

Fungi offer fascinating, tangible ways to reduce emissions and build resilience, from mycelium bricks to fungal-managed soils. These approaches can make meaningful contributions when deployed correctly and at the right scale.

At the same time, fungi have limits: permanence is uncertain, ecological risks exist, and not every fungal solution scales globally or replaces major industrial decarbonization needs.

Ultimately, thinking of fungi as important partners—capable of amplifying human efforts to restore soils, clean landscapes, and make materials more circular—will get us farther than hoping they will single-handedly save the planet.