Climate technology venture capital has undergone a structural transformation. What began as a niche investment thesis pursued by impact-oriented funds has become a mainstream asset class attracting sovereign wealth funds, pension systems, corporate venture arms, and the world’s largest growth equity firms. Total climate tech venture and growth equity investment reached $48.7 billion in 2025, up from $39 billion in 2024 and representing a compound annual growth rate of approximately 28% since 2020. This analysis examines where capital is flowing, which sectors face persistent funding gaps, and the emerging dynamics that will shape climate tech investment through the remainder of the decade.
The Funding Landscape: Concentration and Bifurcation
Climate tech investment is not distributed evenly across the decarbonization spectrum. Capital concentrates overwhelmingly in sectors with clear paths to revenue generation, proven technology, and established market structures. Electric vehicles and battery technology absorbed approximately $18 billion — nearly 37% of total climate tech funding — in 2025. Solar and wind technology and development attracted $8 billion. These sectors benefit from decades of deployment experience, well-understood cost curves, and massive addressable markets with existing customer bases.
The harder, earlier-stage segments of the decarbonization challenge receive disproportionately less capital relative to their emissions reduction potential. Carbon capture and removal attracted approximately $2.8 billion in 2025 — substantial in absolute terms but modest relative to the trillions needed for gigatonne-scale deployment. Green hydrogen and electrolyzer manufacturing drew $3.2 billion, primarily in growth-stage rounds for established players like Electric Hydrogen, Verdagy, and H2Pro. Sustainable aviation fuel (SAF) attracted $1.4 billion, with investments in alcohol-to-jet, Fischer-Tropsch, and power-to-liquid pathways.
This concentration creates a paradox. The sectors receiving the most capital (EVs, solar, batteries) are already on robust cost decline trajectories and face less technology risk. The sectors receiving less capital (industrial decarbonization, carbon removal, long-duration storage, sustainable fuels) face greater technology risk but represent the larger proportion of residual emissions that must be addressed for net-zero. The venture capital market is, to some extent, funding what is easiest rather than what is most needed.
Carbon Removal: The Frontier of Climate Investment
Carbon dioxide removal (CDR) — technologies and approaches that extract CO₂ from the atmosphere and permanently store it — has emerged as the most intellectually vibrant and commercially uncertain frontier of climate tech investment.
Direct Air Capture companies have attracted the largest individual rounds. Climeworks raised $650 million in a Series G round in 2024, valuing the company at approximately $5 billion. Carbon Engineering (now Occidental subsidiary 1PointFive) has received over $1.5 billion in total capital. Newer entrants like Heirloom Carbon (limestone-based DAC), CarbonCapture Inc. (modular solid sorbent systems), and Global Thermostat (amine-based sorbents) have collectively raised over $800 million.
Enhanced Rock Weathering — spreading finely ground silicate minerals (typically basalt) on agricultural land to accelerate the natural chemical reaction that removes CO₂ from the atmosphere — has attracted growing investor interest due to its potential for low-cost, high-volume carbon removal. UNDO, Lithos, and Eion are the leading companies, with combined funding exceeding $200 million. The estimated cost of enhanced weathering is $50–$150 per tonne of CO₂ removed — significantly below DAC — though measurement, reporting, and verification (MRV) challenges create uncertainty around actual removal quantities.
Biochar — heating biomass in the absence of oxygen (pyrolysis) to produce a stable carbon material that resists decomposition for centuries — represents another scalable removal pathway. Companies like Carbofex, Pacific Biochar, and Carbon Cycle have attracted modest funding ($50–$100 million collectively). Biochar’s advantage is its co-benefit profile: the material improves soil health, increases agricultural productivity, and reduces fertiliser requirements. Costs range from $80–$200 per tonne of CO₂ equivalent, depending on biomass source, scale, and logistics.
Ocean-Based CDR is the earliest-stage category, with companies like Equatic, Running Tide, Planetary Technologies, and Ebb Carbon exploring approaches including ocean alkalinity enhancement, electrochemical CO₂ removal from seawater, and macroalgae cultivation and sinking. Total investment in ocean CDR is below $200 million, reflecting both the nascent state of the science and regulatory uncertainty around marine interventions. The theoretical potential is enormous — the ocean is the largest carbon sink on Earth — but commercialisation timelines extend to the 2030s at the earliest.
The CDR market is catalysed by advance market commitments from large technology companies. Frontier, a coalition including Stripe, Alphabet, Meta, Shopify, and McKinsey, has committed $1 billion to purchase carbon removal credits by 2030. Microsoft has signed the largest single CDR contract in history — 315,000 tonnes over six years from Heirloom Carbon. These forward purchase commitments provide the revenue certainty that early-stage CDR companies need to attract venture capital and scale production. The price points — typically $200–$600 per tonne for current purchases, with options at declining prices for future delivery — establish a market that did not exist five years ago.
Grid-Scale Energy Storage: Beyond Lithium-Ion
While lithium-ion batteries dominate short-duration storage (up to 4 hours), the deep decarbonization of electricity grids requires long-duration energy storage (LDES) — systems capable of storing energy for 8 hours to multiple days or weeks. This requirement has spawned a vibrant landscape of competing technologies, each at different stages of maturity and commercialisation.
Iron-Air Batteries. Form Energy, backed by $800 million in total funding, is constructing its first commercial iron-air battery factory in Weirton, West Virginia. The technology uses abundant, inexpensive iron and air to provide 100-hour storage duration at a target cost of $20 per kilowatt-hour — one-fifth the cost of lithium-ion. The Weirton factory will produce 500 MW of annual battery capacity when fully operational. If Form Energy’s cost targets materialise, iron-air storage could fundamentally alter the economics of renewable energy integration, enabling grids to operate reliably with 90%+ renewable penetration without natural gas backup.
Compressed Air Energy Storage (CAES) stores energy by compressing air into underground caverns and releasing it through turbines during peak demand. Hydrostor, a Canadian company, has raised over $400 million and is developing projects in Australia, California, and Ontario with storage durations of 8–12 hours and capacities of 200–500 MW per installation. Advanced CAES systems achieve round-trip efficiency of 60–70%, lower than batteries but offset by extremely low storage costs in geological formations.
Flow Batteries use liquid electrolytes pumped through electrochemical cells, with storage capacity determined by tank size rather than cell count. Vanadium flow batteries (Sumitomo, Invinity) and zinc-bromine systems (Gelion, Eos Energy) target 4–12 hour durations. The primary advantage is indefinite cycle life — flow batteries degrade minimally over thousands of cycles, unlike lithium-ion systems that lose capacity over time. Total flow battery investment exceeds $1.5 billion across the sector.
Green Hydrogen for Seasonal Storage represents the ultimate long-duration solution. Excess renewable electricity converted to hydrogen and stored in underground salt caverns can provide days-to-weeks of energy storage for grid balancing during extended low-wind, low-solar periods (the “Dunkelflaute” problem in northern European grids). The round-trip efficiency is poor (approximately 30–40% for hydrogen production, storage, and re-electrification through fuel cells or turbines), but the essentially unlimited storage capacity makes hydrogen the leading candidate for seasonal energy storage in deeply decarbonized grids. Several European countries are investing in hydrogen storage cavern development specifically for this purpose.
Sustainable Aviation Fuel: The Last Fossil Frontier
Aviation accounts for approximately 2.5% of global CO₂ emissions, and unlike road transport, direct electrification is not feasible for medium and long-haul flights due to battery energy density limitations. Sustainable aviation fuel — liquid hydrocarbons chemically identical to jet fuel but produced from non-fossil feedstocks — is the primary decarbonization pathway for aviation.
SAF production in 2025 reached approximately 1.5 billion litres, representing less than 0.5% of total global jet fuel consumption. The International Civil Aviation Organization’s CORSIA framework and the EU’s ReFuelEU Aviation mandate (requiring SAF blending rates of 2% in 2025, 6% in 2030, 20% in 2035, and 70% in 2050) create regulatory demand pull, but supply remains severely constrained.
HEFA (Hydroprocessed Esters and Fatty Acids) — SAF produced from waste fats, oils, and greases — dominates current production (approximately 85% of SAF supply). Neste, the Finnish refiner, is the world’s largest SAF producer with capacity of approximately 1.5 million tonnes per year across its Singapore, Rotterdam, and Porvoo facilities. The feedstock constraint for HEFA-SAF is clear: global waste fat and oil supply can support approximately 5–8 million tonnes of annual SAF production — far below the 300+ million tonnes needed for full aviation decarbonization.
Alcohol-to-Jet (AtJ) pathways, using ethanol produced from agricultural waste or purpose-grown feedstocks, are scaling toward commercialisation. LanzaJet, backed by $500 million in investment including from Microsoft’s Climate Innovation Fund and Shell, commenced production at its Georgia facility in 2024 with a capacity of 38 million litres per year. AtJ technology can theoretically scale to meet a significant portion of SAF demand, but feedstock availability and sustainability certification remain constraints.
Power-to-Liquid (PtL) or e-SAF — produced from green hydrogen and captured CO₂ via the Fischer-Tropsch process — represents the ultimate sustainable aviation fuel with near-zero lifecycle emissions. However, current costs are extreme: approximately $3,000–$5,000 per tonne compared to $700–$900 per tonne for conventional jet fuel. HIF Global, Norsk e-Fuel, and Atmosfair are developing early PtL facilities, but commercial-scale e-SAF production remains a 2030+ proposition.
Venture capital is flowing to SAF, but the capital intensity of fuel production means that most investment takes the form of project finance and strategic corporate investment rather than traditional VC rounds. Total SAF-related investment (including facility construction) exceeded $10 billion in announced commitments in 2025, though many projects await final investment decisions.
The Maturation of Climate Tech as an Asset Class
Several structural trends indicate that climate tech is transitioning from a venture-stage phenomenon to a mature institutional asset class.
Fund Size Growth. Dedicated climate tech venture funds have scaled dramatically. Breakthrough Energy Ventures (Bill Gates-backed) manages over $3.5 billion across three funds. Congruent Ventures, Lowercarbon Capital, Prelude Ventures, and Fifth Wall’s climate fund collectively manage over $5 billion. Mainstream generalist firms — Sequoia, a16z, Khosla Ventures, and Tiger Global — have established climate tech practices or dedicated funds, bringing additional billions in deployable capital.
Corporate Venture Integration. Every major energy company now operates a climate tech venture arm. BP Ventures, Shell Ventures, Chevron Technology Ventures, TotalEnergies Ventures, Equinor Ventures, and Saudi Aramco’s Prosperity7 collectively invest approximately $3 billion annually in climate tech startups. These corporate investors bring more than capital: they provide market access, pilot opportunities, and commercial partnerships that pure financial investors cannot match. The trade-off is potential strategic constraints — corporate backers may limit portfolio companies’ commercial relationships with competitors.
Exit Environment. Climate tech exits have diversified beyond the IPO pathway. Strategic acquisitions by energy and industrial companies (Occidental’s acquisition of Carbon Engineering, Baker Hughes’s investment in NET Power, Fortescue’s acquisition of Williams Advanced Engineering) validate technology and provide liquidity. SPACs, while less prominent than in the 2021 peak, continue to bring climate tech companies to public markets. The secondary market for climate tech venture stakes has grown substantially, providing interim liquidity for early investors in companies with long development timelines.
Government De-Risking. Public finance institutions are increasingly co-investing alongside private capital, reducing risk for venture investors. The US Department of Energy’s Loan Programs Office has committed over $40 billion in conditional loan guarantees to clean energy and climate tech projects. The European Innovation Council Fund takes equity positions in early-stage climate companies. The UK Infrastructure Bank provides subordinated debt and equity for climate infrastructure projects. This blended finance approach — public capital absorbing first-loss risk while private capital provides scale — is proving effective at accelerating commercialisation timelines for capital-intensive climate technologies.
The Funding Gap: Where Capital Is Missing
Despite the growth in climate tech investment, significant funding gaps persist. The IEA estimates that annual clean energy investment must reach $4.5 trillion by 2030 (up from approximately $2 trillion in 2025) to maintain a pathway to net-zero by 2050. The gap is particularly acute in several areas:
Industrial Decarbonization receives less than 5% of climate tech venture investment despite representing approximately 30% of global emissions. The long development timelines, capital intensity, and commodity market exposure of industrial decarbonization companies make them poor fits for traditional 7–10 year venture fund lifecycles.
Emerging Market Deployment. Over 70% of climate tech venture capital is invested in companies based in the United States and Europe, despite the fact that the majority of future emissions growth will occur in developing economies. The risk-return profile of climate tech deployment in Sub-Saharan Africa, South and Southeast Asia, and Latin America does not align with traditional venture capital expectations, creating a structural gap that concessional and development finance must fill.
Nature-Based Solutions and Agriculture receive modest venture attention relative to their mitigation potential. Soil carbon, sustainable agriculture, forest management, and wetland restoration collectively represent over 10 gigatonnes of annual mitigation potential, but the fragmented, low-margin economics of these sectors limit venture-scale investment opportunities.
The 2026 climate tech funding landscape reflects an asset class in transition — past the hype cycles and inflated expectations of 2021, but not yet fully mature in its risk-return profile and institutional infrastructure. The companies and investors that navigate this transition successfully will shape the multi-trillion-dollar industrial transformation that defines the coming decades of the global economy.