The Paris Agreement and steel structures: carbon reduction policies in various countries
With the Paris Agreement enshrining the commitment to limiting global warming to 1.5°C in law, the construction industry, a major carbon emitter, has become a key battleground for emissions reduction. Steel structures, with their recyclable properties and low-carbon construction advantages, are playing a crucial role in this climate action. However, the vastly different policy paths of various countries are charting drastically different roadmaps for the industry’s development.
I. Policy-Driven Market
The European Union has established the world’s most stringent building carbon management system through the European Green Deal. The Building Energy Efficiency Directive, which came into effect in 2023, requires new public buildings to meet near-zero energy consumption standards, and steel structures, with their high prefabrication rate and recycling rate exceeding 90%, have become the preferred choice for developers. Germany has further introduced “Passive House Certification,” offering projects using steel structures a maximum 15% floor area ratio bonus. Japan, through its Green Growth Strategy, has established a special fund providing a subsidy of 3,000 yen per square meter for super high-rise buildings using high-strength steel (such as Q690 grade), promoting the development of steel structures towards high-rise buildings.
These policies send clear market signals. In the EU, the proportion of steel-structured buildings increased from 18% in 2015 to 27% in 2022. The Tokyo Metropolitan Government in Japan has even mandated that buildings exceeding 60 meters in height must use steel structures after 2030. These policy benefits directly boosted demand; data from the European Steel Association shows that EU steel structure orders increased by 22% year-on-year in 2023, with green building projects accounting for 68%.
II. A Market Under Pressure to Transform
Although the US did not fulfill its collective commitments under the Paris Agreement, the Inflation Reduction Act passed in 2022 reshaped trade rules with its “carbon border adjustment mechanism.” This act imposed a carbon tariff of $55 per tonne on imported steel, forcing domestic builders to prioritize low-carbon steel. Data from the American Steel Construction Association shows that in 2023, the proportion of low-carbon steel purchased by US steel structure companies jumped from 35% to 58%. However, policies vary significantly across US states: California mandates that new commercial buildings use at least 30% recycled steel, while Texas still allows tax breaks for traditional steel. This fragmented policy has resulted in a national steel structure penetration rate of only around 19%.
Even more challenging is the cost pressure. The American Iron and Steel Institute estimates that low-carbon steel meeting IRA standards is 12%-15% more expensive than ordinary steel, making small and medium-sized developers more inclined to choose concrete structures. This contradiction highlights the difficulty of policy implementation—finding a balance between emission reduction targets and economic feasibility.
III. The Dual Dilemma of Emerging Markets
As the world’s second-largest steel consumer, India has set a net-zero target for 2070, but its construction industry still relies heavily on traditional brick-and-mortar structures (accounting for 78%). Although the government has launched a “Green Building Mission,” incentives for steel structures are limited to public projects such as airports and subway stations. More seriously, India’s steel industry has a carbon intensity of 2.2 tons of CO₂ per ton of steel (compared to a global average of 1.85 tons), and domestic steel mills lack funds for low-carbon technology upgrades, making it difficult to realize the full life-cycle carbon emission advantages of steel structures. Brazil, meanwhile, is caught in the “resource curse.” As the world’s largest iron ore exporter, its steel industry relies on high-carbon emission blast furnace processes (accounting for 92%), and the government has been reluctant to raise environmental standards in order to protect employment. Despite calls from the Brazilian Steel Structures Association to promote prefabricated steel structures, in 2023, the proportion of steel structure buildings nationwide was only 8%, far below the global average. This policy inertia has gradually marginalized Brazil in the global wave of low-carbon construction.
IV. Breakthrough Strategies for the Steel Structure Industry
Faced with policy divergence, steel structure companies need to adopt differentiated strategies:
- Technological Upgrading: Developing low-carbon steel (such as hydrogen-based steelmaking processes) and optimizing node design to reduce steel consumption.
- Standard Alignment: Actively participating in green building certification systems in various countries (such as LEED and BREEAM).
- Circular Economy: Establishing scrap steel recycling networks to improve material reuse rates.
China, as the world’s largest steel structure producer (accounting for 54% of global production), is promoting industry transformation through “dual-carbon” policies. The Ministry of Housing and Urban-Rural Development’s “14th Five-Year Plan for the Development of the Construction Industry” clearly requires that by 2025, prefabricated buildings account for 30% of new buildings, with steel structures accounting for over 40%. Baowu Group has already built the world’s first million-ton-level hydrogen-based vertical shaft furnace demonstration line, reducing the carbon footprint of steel by 30%, providing a technological model for the industry.
As the Paris Agreement enters its critical implementation phase, the steel structure industry stands at a historical crossroads. Those companies that can quickly adapt to policy changes and master low-carbon technologies will gain a competitive edge in the global construction revolution. As the International Energy Agency stated, “Decarbonization in the construction industry is not an option, but a necessity, and steel structures may be one of the most elegant answers.” In this green transformation, the synergistic innovation of policy and technology will ultimately determine who the final winners are.