Data story: Key signals in Low-carbon materials (cement, steel, timber)

Global cement and steel production together account for approximately 15% of anthropogenic CO2 emissions, releasing roughly 4.4 billion tonnes annually. Yet investment in low-carbon alternatives reached $12.8 billion in 2025, a 47% increase over 2024 and more than triple the 2022 figure. The data signals emerging from this sector tell a story of rapid cost curve compression, accelerating policy mandates, and a procurement landscape shifting faster than most founders and investors anticipated. This data story tracks the quantitative indicators that reveal where the low-carbon materials market is heading and where the value creation opportunities concentrate.

Why It Matters

The built environment consumes approximately 50% of all raw materials extracted globally, and construction materials represent the single largest category of embodied carbon in buildings and infrastructure. The International Energy Agency estimates that cement production alone generates 2.4 billion tonnes of CO2 annually (approximately 7% of global emissions), while steel production contributes 2.0 billion tonnes (approximately 7-8%). Timber, by contrast, sequesters 1.1 tonnes of CO2 per cubic meter, but sustainably harvested timber represents less than 3% of structural materials by volume in commercial construction globally.

Three converging forces are reshaping this landscape. First, regulatory mandates are creating binding demand signals. The EU Carbon Border Adjustment Mechanism (CBAM), which entered its transitional phase in October 2023 and moves to full implementation in January 2026, imposes carbon costs on imported cement, steel, and aluminum. By 2026, importers will purchase CBAM certificates reflecting the EU Emissions Trading System carbon price, which averaged 68 euros per tonne in 2025. California's Buy Clean Act, expanded in 2024, sets maximum Global Warming Potential (GWP) thresholds for structural steel and concrete purchased with state funds. At least 11 US states and the federal government (through the Inflation Reduction Act's Section 45X and the Federal Buy Clean Initiative) have enacted comparable procurement mandates.

Second, corporate procurement commitments are creating forward demand. The First Movers Coalition, convened by the World Economic Forum and the US Department of State, includes 96 companies committing to purchase near-zero emissions steel and cement. Members collectively represent over $12 trillion in market capitalization and have pledged to source at least 10% of their steel and cement from near-zero producers by 2030. ConcreteZero, a parallel initiative led by the Climate Group, includes 72 corporate members committing to 100% net-zero concrete by 2050, with interim targets of 30% low-carbon concrete by 2030.

Third, cost trajectories are crossing critical thresholds. The "green premium," defined as the percentage cost increase of low-carbon alternatives over conventional materials, has compressed faster than projected across all three material categories. Founders building in this space need to understand precisely where cost curves sit, where they are heading, and which segments will reach price parity first.

Key Signals

Green Premium Compression

Material	Green Premium (2022)	Green Premium (2025)	Projected (2028)
Low-carbon cement (blended, SCMs)	15-25%	5-12%	0-5%
Low-carbon cement (CCUS-equipped)	70-120%	45-75%	25-40%
Green steel (H2-DRI-EAF)	40-60%	20-35%	10-20%
Green steel (scrap-EAF, renewable)	5-15%	0-8%	Price parity
Mass timber (CLT, glulam)	10-30%	0-15%	Price parity to -5%
Engineered bamboo (structural)	25-45%	15-30%	8-18%

The most significant shift has occurred in supplementary cementitious materials (SCMs), where blended cements using calcined clay, fly ash, or ground granulated blast furnace slag now approach cost parity with ordinary Portland cement in multiple markets. LC3 (Limestone Calcined Clay Cement) technology, which reduces clinker content by 40-50% and emissions by 30-40%, has reached commercial deployment in India, Colombia, Cuba, and Malawi. Heidelberg Materials, Holcim, and CEMEX collectively operated 14 commercial LC3 production lines by the end of 2025.

Investment Flow Signals

Venture capital and growth equity investment in low-carbon materials companies reached $4.1 billion in 2025, distributed across distinct technology segments:

Segment	2023 Investment	2024 Investment	2025 Investment	Key Deals
Green steel (H2-DRI)	$1.2B	$2.1B	$3.4B	H2 Green Steel ($1.5B Series B), Boston Metal ($262M Series C)
Low-carbon cement	$380M	$620M	$890M	Sublime Systems ($87M Series B), Brimstone ($189M Series B)
Carbon-cured concrete	$120M	$210M	$340M	CarbonCure ($130M growth), Solidia ($78M Series C)
Mass timber manufacturing	$280M	$410M	$580M	Mercer Mass Timber ($240M facility), Katerra successors
Carbon capture for materials	$450M	$780M	$1.1B	Heidelberg Materials Brevik ($700M CCUS facility)
Novel binders and chemistries	$90M	$180M	$310M	Terra CO2 ($42M Series B), Fortera ($48M Series B)

Green steel dominates investment flows, with H2 Green Steel's $1.5 billion Series B in 2024 representing the largest single raise in the sector's history. The company's Boden plant in northern Sweden, scheduled for first production in 2026, will produce 2.5 million tonnes of near-zero emissions steel annually using hydrogen direct reduction and electric arc furnace technology powered by Nordic hydroelectric and wind resources. SSAB's HYBRIT pilot, which delivered its first fossil-free steel to Volvo in 2021, has progressed to commercial-scale demonstration producing 1.3 million tonnes annually.

Production Capacity Signals

Announced low-carbon production capacity provides the clearest forward indicator of market transformation:

Material	Current Low-Carbon Capacity (2025)	Announced Capacity (by 2030)	% of Global Production
Green steel (H2-DRI)	2.8 Mt/yr	28-35 Mt/yr	1.5% of 1,900 Mt
Low-carbon cement (>30% emissions reduction)	180 Mt/yr	450-550 Mt/yr	10-13% of 4,200 Mt
Carbon-captured cement	1.2 Mt/yr	15-20 Mt/yr	<0.5% of 4,200 Mt
Mass timber (structural grade)	8.2 million m3/yr	18-22 million m3/yr	~3% of structural materials

The disparity between green steel's small current capacity and its large announced pipeline reflects the capital intensity and long development timelines of integrated steelmaking facilities. Each H2-DRI-EAF plant requires $2-4 billion in capital expenditure and 4-6 years from final investment decision to first production. The pipeline is geographically concentrated: Sweden, Finland, Germany, Austria, and Spain account for 75% of announced European green steel capacity, while the Middle East (Saudi Arabia, UAE, Oman) accounts for the largest share of announced capacity outside Europe, leveraging low-cost solar power for green hydrogen production.

Policy and Carbon Pricing Signals

Carbon pricing mechanisms increasingly determine the competitive dynamics between conventional and low-carbon materials:

Jurisdiction	Carbon Price (2025)	Projected (2028)	Coverage of Materials
EU ETS	65-72 euros/tCO2	90-120 euros/tCO2	Cement, steel, aluminum
UK ETS	42-55 GBP/tCO2	70-90 GBP/tCO2	Cement, steel
California (CCI)	$38-42/tCO2	$55-70/tCO2	Cement
China national ETS	$10-14/tCO2	$18-25/tCO2	Steel (from 2025)
CBAM (effective rate)	EU ETS equivalent	EU ETS equivalent	Cement, steel, aluminum imports

The EU ETS carbon price must reach approximately 80-100 euros per tonne for green steel produced via H2-DRI to reach cost parity with conventional blast furnace steel in Europe, assuming green hydrogen costs of 3-4 euros per kilogram. Current trajectories suggest this threshold will be crossed between 2027 and 2029. For low-carbon cement using SCMs, cost parity has already been achieved in markets with carbon prices above 50 euros per tonne, as the primary cost driver is clinker reduction rather than expensive abatement technology.

Procurement and Demand Signals

Corporate and government procurement mandates are creating binding demand floors:

The US General Services Administration's Federal Buy Clean Initiative established maximum embodied carbon limits for concrete and steel purchased for federal projects, effective January 2025. Initial thresholds were set at the 80th percentile of current Environmental Product Declarations (EPDs), meaning only the top 20% of lowest-carbon products qualify. Thresholds will tighten to the 60th percentile by 2028 and the 40th percentile by 2030, progressively excluding higher-carbon producers.

The number of buildings requiring Whole Life Carbon Assessments (WLCA) has increased from approximately 200 projects in 2022 to over 3,400 in 2025. London's Greater London Authority, the Netherlands' MPG (Milieu Prestatie Gebouwen) regulation, France's RE2020, and Denmark's CO2 limits for new buildings all mandate WLCA with binding limits. These requirements are driving specifier demand for EPD-verified low-carbon materials and creating competitive advantages for producers with verified low-carbon product portfolios.

Key Players

Cement and Concrete

Holcim leads in low-carbon cement commercialization, with its ECOPact line achieving 30-100% lower carbon intensity than standard concrete. ECOPact represented 16% of Holcim's net sales in 2025, up from 8% in 2023, demonstrating rapidly scaling commercial demand for low-carbon concrete products.

Heidelberg Materials operates the world's first full-scale carbon capture facility on a cement plant at Brevik, Norway, designed to capture 400,000 tonnes of CO2 annually. The $700 million project, operational since late 2025, demonstrates technical feasibility but at significant capital cost.

Sublime Systems and Brimstone represent the most funded startup approaches to fundamentally decarbonizing cement chemistry. Sublime uses electrochemistry to produce calcium silicate cement at ambient temperature, while Brimstone produces Portland-compatible cement from calcium silicate rocks rather than limestone, generating no process CO2 emissions.

Steel

H2 Green Steel and SSAB/HYBRIT are the leading European green steel producers, with combined announced capacity exceeding 7 million tonnes by 2030. Both use hydrogen direct reduction of iron ore followed by electric arc furnace steelmaking.

Boston Metal has developed molten oxide electrolysis, a fundamentally different approach that uses electricity to directly reduce iron ore in a single step without hydrogen or coke. The technology promises 80-95% emissions reduction and recently secured $262 million in Series C funding.

Nucor and Steel Dynamics, the two largest US electric arc furnace steelmakers, already produce steel at 75-80% lower carbon intensity than integrated blast furnace producers by using recycled scrap as feedstock. Their increasing use of renewable power purchase agreements is pushing carbon intensity below 0.4 tonnes CO2 per tonne of steel, compared to 1.8-2.2 for conventional blast furnace production.

Mass Timber

Mercer International invested $240 million in a mass timber manufacturing facility in British Columbia, with capacity for 120,000 cubic meters of cross-laminated timber (CLT) annually. Stora Enso, the world's largest CLT producer, operated five production facilities across Europe with combined capacity exceeding 300,000 cubic meters in 2025.

Action Checklist

• Track green premium trajectories quarterly for your target material categories, using published EPD databases and producer price lists
• Map announced production capacity against your projected demand timelines to identify supply constraints and early-mover procurement opportunities
• Monitor carbon pricing trajectories in your operating jurisdictions, as these directly determine competitive dynamics between conventional and low-carbon materials
• Evaluate Buy Clean Act thresholds and CBAM certificate requirements to understand compliance timelines and cost implications for your supply chain
• Engage with First Movers Coalition and ConcreteZero members as potential offtake partners or reference customers
• Assess mass timber feasibility for structural applications where building codes permit, as cost parity has been reached in several markets
• Build relationships with EPD program operators (ICC-ES, EPD International, NSF) to ensure your products have verified environmental declarations

FAQ

Q: Which low-carbon material segment offers the largest near-term market opportunity for founders? A: Low-carbon cement and concrete represent the largest addressable market by volume and the fastest path to cost parity. SCM-based approaches (calcined clay, LC3) have reached or are approaching cost parity in multiple markets without requiring CCUS infrastructure. Carbon-cured concrete technologies (CarbonCure, Solidia) offer retrofit solutions for existing producers. The global cement market exceeds $400 billion annually, and regulatory mandates are creating binding demand for low-carbon alternatives across the EU, US, and increasingly in Asia.

Q: How reliable are announced green steel capacity figures? A: Announced capacity should be discounted by 30-40% based on historical project completion rates. Final investment decisions have been secured for approximately 60% of announced European green steel capacity, but projects remain contingent on green hydrogen availability, grid connection timelines, and long-term offtake agreements. The most credible projects (H2 Green Steel, HYBRIT/SSAB, Salzgitter) have secured both financing and binding customer commitments.

Q: What carbon price level makes green steel cost-competitive with conventional production? A: At current green hydrogen costs of 3-5 euros per kilogram, green steel via H2-DRI-EAF reaches cost parity with conventional blast furnace steel at carbon prices of 80-120 euros per tonne. As green hydrogen costs decline toward the EU's 2030 target of 1.5-2.0 euros per kilogram, the break-even carbon price drops to 40-60 euros per tonne. Scrap-based EAF steel powered by renewable electricity is already cost-competitive in most markets without carbon pricing.

Q: Is mass timber a viable structural alternative at commercial scale? A: Yes, for buildings up to 18-20 stories in jurisdictions with updated building codes. The 2021 International Building Code (IBC) permits mass timber construction up to 18 stories (Type IV-A), and projects including Ascent in Milwaukee (25 stories, the tallest timber building in North America) demonstrate technical feasibility. Cost competitiveness depends on local factors including timber supply, labor availability, and fire code requirements. In the Pacific Northwest, Scandinavia, and Central Europe, mass timber achieves cost parity with concrete and steel for mid-rise construction (6-12 stories).

Sources

• International Energy Agency. (2025). Cement Technology Roadmap: Carbon Emissions Reductions up to 2050, Updated Assessment. Paris: IEA Publications.
• World Steel Association. (2025). Steel Statistical Yearbook 2025 and Climate Action Report. Brussels: worldsteel.
• BloombergNEF. (2025). New Energy Outlook: Materials Transition, 2025 Edition. New York: Bloomberg LP.
• Mission Possible Partnership. (2025). Net-Zero Steel: Sector Transition Strategy, Progress Report. London: MPP.
• Global Cement and Concrete Association. (2025). Concrete Future: The GCCA 2050 Cement and Concrete Industry Roadmap for Net Zero Concrete. London: GCCA.
• First Movers Coalition. (2025). Annual Progress Report: Near-Zero Procurement Commitments and Delivery. Geneva: World Economic Forum.
• Rocky Mountain Institute. (2025). Green Steel Tracker: Global Project Pipeline and Cost Analysis. Boulder, CO: RMI.