Overview
For decades, steel mills have powered America's manufacturing heartland — building our skyscrapers, our cars, and the machinery that defines daily life. But that industrial might has come at a cost: steel towns have carried the burden of pollution in their bodies, with higher rates of asthma, cancer, and chronic illness, while companies insisted that coal was the only way to make steel. Protecting jobs meant accepting pollution.
At the center of the problem is the blast furnace, a 14th-century technology that burns massive quantities of coal-based coke to produce iron that can be turned into steel. Eight integrated steel mills clustered around the Great Lakes still make steel this way, each emitting roughly as much carbon dioxide as a coal-fired power plant.
That story is finally changing, but not everywhere. Companies are investing in modern, coal-free facilities in the U.S., and automakers are beginning to demand low-emissions steel. Without intervention, these communities will be left to bear the pollution while steel jobs move elsewhere.
Now steel companies face a choice. Cleveland-Cliffs and Nippon/U.S. Steel could invest in modernizing their Great Lakes mills. Instead, they're moving to reline their blast furnaces — a decision that would lock these communities into decades more coal-based pollution at the exact moment cleaner technology is becoming viable. If the clean transition accelerates only in the South, the communities that sacrificed the most for this industry will be left behind by it, too.
The future of steel will be clean. No one is better positioned to lead it than the communities that built this industry. Steel towns powered a century of American progress, and they deserve to shape the next era with modern mills, good union jobs, clean air, and a livable climate. This time, progress should lift the people who made it possible.
U.S. primary coking, iron and steel facilities

There are eight integrated steel mills in the U.S., spread throughout the industrial heartland. These facilities use massive quantities of coking coal to produce iron and steel, essential materials for the clean energy economy.
To learn more about these mills, visit our U.S. Industrial Facilities Tracking Tool, here.
Chart: The steel industry’s contribution to industrial greenhouse gas pollution (scope one), globally.

Globally, steel production is the largest source of climate pollution within industry. When upstream emissions from coal mine methane are included, the sector contributes a whopping 11% of global anthropogenic emissions. Data source: IPCC Sixth Assessment Report, IEA 2022 World Energy Outlook, World Steel Dynamic.
Solutions
A proven method of ironmaking known as direct reduced iron (DRI) already accounts for 20% of U.S. iron production today and can eliminate the bulk of ironmaking's climate and health-harming pollution if powered by green hydrogen. Newer technologies like molten oxide electrolysis are moving closer to being market-ready. New DRI facilities have already been announced and will soon be competing directly with blast furnaces for customers.
Regional analysis from Indiana and Pennsylvania shows that failure to invest in green steel means risking jobs and economic growth. Rather than securing the region's workforce, coal-based steelmaking is projected to cost Northwest Indiana 12,000 jobs by 2034 across the region’s three integrated mills, according to the same Indiana University analysis.
The risk is that modernization accelerates only in Sunbelt states, leaving legacy steel communities behind. Other countries, from Namibia to Sweden, are already constructing green steel plants. However, all existing DRI facilities rely on methane, and new projects still lack clear timelines for transitioning to green hydrogen. Without a credible, fleet-wide pathway off fossil fuels, this new capacity risks locking in fossil fuel dependence rather than delivering the pollution cuts the technology is capable of.
And rather than compete on either front, major steelmakers like Cleveland-Cliffs and Nippon Steel are choosing to fall further behind: pursuing blast furnace relinings — investments that would extend the life of coal-burning mills for decades — when they could instead reinvest in modernization.
Our work
The challenge ahead is great — but so is the momentum. We are working to ensure that the U.S. steel industry's transition happens in a way that centers the workers and communities who built it. We're leveraging data and analytics, field building, communications, and campaign power to:
Stop Dirty Relines
Three blast furnace relines are now in the pipeline, each one a bet that coal-based steelmaking still has decades left. U.S. Steel, now owned by Nippon Steel, is relining Blast Furnace #14 at Gary Works in Indiana this spring. Cleveland-Cliffs is pursuing relines at both Middletown Works in Ohio and Burns Harbor in Indiana. Each reline locks these communities into another 15-20 years of coal-based pollution at the exact moment cleaner alternatives exist. We're working with fenceline organizations in Indiana and Ohio to raise the reputational and political costs of relining. Learn why Cleveland-Cliffs' retreat from a transition to clean steel at Middletown Works is so concerning.
Push Nippon Steel to Reinvest, Not Reline
Nippon Steel's acquisition of U.S. Steel gives it a choice: bring clean technology to legacy steel communities, or double down on coal. The company has already shown it's willing to invest billions. We're working with partners to ensure that they deliver the kind of clean, modern steel investments that will enable these communities to compete in the future. Learn why it’s critical that steel communities like Gary, Indiana are the first to benefit from the transition to clean steel.
Demonstrate Demand
The automotive industry, responsible for 30% of Cleveland Cliffs' and 22% of U.S. Steel's 2022 sales, is key to steering the steel industry towards sustainability. We’re working with partners to urge major players like GM and Ford to invest in cleaner supply chains through the Lead the Charge campaign. Learn why clean EVs need clean steel from our op-ed in Energy Monitor.
Hold Polluters Accountable
Through sharp communications, data and analysis and focused campaigns, we’re holding the steel industry accountable for its pollution while uplifting the stories of impacted residents. Learn how iron and steel facilities are some of the worst industrial polluters in the U.S. and how impacted residents are fighting for their right to clean air and water.


