What is it about?
China produces over half of the world's steel, mostly using traditional coal-based methods that generate massive carbon emissions. Decarbonizing this sector is essential for global climate goals, but it is extremely challenging because steel companies must balance economic survival with the high costs of new technology. To understand how this transition might happen, we built a computer simulation (an agent-based model) representing thousands of individual Chinese steel plants to see how they would react to different policies and technological breakthroughs. Our model reveals that strict climate policies alone are not enough. If policies are pushed without affordable clean tech, companies will lock themselves into short-term fixes instead of fully upgrading their facilities. Conversely, relying only on technology takes too long. We found that to successfully reach 90-95% emission reductions by 2060, policymakers must synchronize strict environmental regulations with rapidly falling costs for clean technologies, like green hydrogen and electric arc furnaces. This synergistic approach is the only way to ensure companies fully transition to green steelmaking without wasting billions on obsolete infrastructure.
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Why is it important?
Conventional climate models often overlook the complex, real-world decisions made by individual companies. This research is unique because it bridges this gap using an agent-based model to simulate the behavior of thousands of heterogeneous steel firms in China. Our findings are timely and critical for policymakers: we show that relying solely on aggressive carbon pricing or waiting for technological breakthroughs will fail, leading to either a dangerous "carbon lock-in" with fossil-based technologies or severely delayed climate action. By demonstrating the absolute necessity of a synergistic approach—combining strict policies with targeted support for rapid technology cost declines—this work provides a practical blueprint for navigating the transition to carbon-neutral heavy industries globally without triggering massive economic disruption or stranded assets.
Perspectives
As researchers observing the immense challenge of industrial decarbonization, we realized that treating the steel sector as a single, rational entity in macroeconomic models was a fundamental flaw. Real companies face immense sunk costs and risky investments, which often lead them to choose safe, incremental retrofits over transformative green technologies. Our simulation vividly highlights a very narrow corridor for success. We found that a standalone carbon price can actually be destabilizing early on, acting more as a penalty than an enabler when affordable green alternatives, like hydrogen, aren't yet viable. We hope this study shifts the global conversation from merely setting ambitious climate targets to designing smart, sequenced industrial policies that actively support companies through this daunting sociotechnical transition.
Xiao Liu
Chinese Research Academy of Environmental Sciences
Read the Original
This page is a summary of: Bridging national climate targets and firm-level decisions: An agent-based model of China’s steel decarbonization pathways, Proceedings of the National Academy of Sciences, June 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2528009123.
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