Mitigation Research

Decarbonizing Iron and Steel: Strategy Report

Summary

  • Why is decarbonizing iron and steel important? 

Iron and steel is the heaviest-emitting industrial sector, at ~4.4 billion metric tons of CO2-equivalent (tCO2e) per year, or 8% of global emissions. Emissions arise primarily from using fossil fuels to reduce iron ore to iron, and substantial emissions are also produced during the conversion of iron into steel. The current pipeline of primary green steel plants would meet less than 2% of today’s steel demand, which is projected to grow by more than a third by 2050.

  • How could efforts to decarbonize iron and steel reduce greenhouse gases?

Pathways to decarbonize iron and steel involve substituting fossil-fuel inputs with green hydrogen and electricity. The leading solution for decarbonizing iron and steel is the hydrogen-direct-reduced iron (H2-DRI) plus electric arc furnace (EAF) pathway. H2-DRI replaces iron ore conversion, which traditionally runs on coal, or increasingly, natural gas. The EAF step replaces coal-based furnaces, which convert iron to steel. Electrochemical technologies are an emerging alternative to H2 DRI, which could be less energy-intensive and do not require green hydrogen, a key driver of cost, as a raw material. 

  • What do our findings suggest are the most promising philanthropic sub-strategies for reducing iron and steel emissions? 

Based on our research into relevant mitigation sub-strategies, we think the most promising philanthropic sub-strategies to decarbonize iron and steel are improving and accelerating the allocation of government innovation funds, supporting government low-carbon procurement commitments, and supporting governments in establishing regulatory frameworks. We also see strong potential for sub-strategies to support green trade policy, facilitate corporate low-carbon procurement commitments, and facilitate early-mover plant construction. 

  • Is there room for more funding? 

We estimate that efforts to decarbonize iron and steel receive ~$60 million USD in philanthropic funding per year, equivalent to less than 1% of total philanthropic climate funding—disproportionately low against steel's share of global emissions.

We are unsure how much public and private funding is directed specifically at iron and steel. However, industrial decarbonization as a whole received $29 billion in 2024, just 1.5% of total climate finance. Even if it absorbed all of this funding, we think efforts to decarbonize iron and steel would remain severely underfunded.

  • Are there major co-benefits or potential risks? 

Decarbonizing iron and steel has the co-benefits of reducing air pollution and facilitating technology spillover by supporting the green hydrogen economy. At the same time, it could have unclear effects on global employment.

  • What are the key uncertainties and open questions? 

Our key uncertainties include the relative value of supporting new green steel pathways versus pressuring legacy plants to close, whether green steel can become cost-competitive, and the role of carbon capture, utilization, and storage (CCUS).

  • What is the bottom line, and what are the next steps? 

Given steel's position as the heaviest-emitting industrial sector, the availability of promising pathways to decarbonize steel, the gap between current green steel capacity and net-zero-aligned trajectories, and the low level of transitional funding this sector presently receives, we think it is important to direct more philanthropic funding toward decarbonizing iron and steel.

We recommend that philanthropists consider funding organizations working to address the challenges outlined in this report and consider grants aligned with the strategies we have laid out.

The findings in this report will inform the grantmaking strategy for the Giving Green Fund and our list of Top Climate Nonprofits. Therefore, donors interested in progressing this work can choose to donate directly to the Giving Green Fund.

Giving Green’s cost-effectiveness analysis for this strategy is still being finalized and will be added to the report when completed.

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