Industry accounts for 25% of global CO2 emissions, making it one of the hardest sectors to clean up. The biggest culprits are steel, cement, and petrochemicals, all of which require extreme heat or chemical reactions that release carbon as a byproduct. Cutting those emissions requires a combination of strategies: switching fuels, redesigning processes, capturing carbon, recycling more materials, and putting the right financial incentives in place.
Why Industrial Emissions Are So Hard to Cut
Most industrial CO2 doesn’t come from keeping the lights on. It comes from the core chemistry of making things. Producing cement, for example, requires heating limestone to over 1,400°C, a reaction that releases CO2 as a direct chemical byproduct regardless of the energy source. Steelmaking traditionally relies on coal-fired blast furnaces to strip oxygen from iron ore. These processes have been optimized over decades, leaving relatively little room for simple efficiency gains.
The International Energy Agency’s Net Zero by 2050 roadmap calls for the global rate of energy intensity improvement to average 4% per year through 2030, roughly three times the pace of the last two decades. That gives a sense of how dramatically industry needs to accelerate compared to business as usual.
Switching to Cleaner Fuels
One of the most direct ways to cut industrial emissions is replacing fossil fuels with low-carbon alternatives. Green hydrogen, produced using renewable electricity to split water, is the leading candidate for sectors that need very high temperatures.
In steelmaking, hydrogen can replace coal in a process called direct reduction, where hydrogen strips oxygen from iron ore instead of carbon doing the job. A fully hydrogen-based direct reduction process produces emissions comparable to recycling scrap steel in an electric arc furnace, which is already one of the lowest-carbon steelmaking methods available. A partial hydrogen process still achieves roughly a 43% emissions reduction compared to conventional blast furnaces. The gap between partial and full hydrogen adoption is significant, which means the climate benefit depends heavily on how completely a plant commits to the switch.
Electrifying High-Heat Processes
Where electricity can replace combustion, it should. Electric arc furnaces are the clearest success story: they use electricity to generate the extreme heat needed to melt steel, eliminating the need for coal-fired blast furnaces entirely. When powered by clean electricity, they offer a genuinely low-carbon route to steelmaking. The global steel industry is already pivoting in this direction, though progress varies by region.
Electrification works best when paired with a clean grid. An electric arc furnace running on coal-generated power still produces substantial emissions. For countries still dependent on fossil fuels for electricity, the emissions benefit is smaller but still meaningful, since electric processes tend to be more energy-efficient than combustion-based ones.
Rethinking Cement and Clinker
Cement is responsible for roughly 8% of global CO2 emissions on its own, and most of that comes from producing clinker, theiteiteiteiteite activeite ingredient. One proven strategy is simply using less clinker per ton of cement by substituting other materials that provide similar binding properties.
Several supplementary materials can partially replace clinker:
- Fly ash (a byproduct of coal power plants) can replace up to 70% of cement content, producing what’s known as high-volume fly ash concrete.
- Ground granulated blast furnace slag can replace up to 40% of cement without requiring additional chemical additives.
- Rice husk ash and silica fume offer smaller but still meaningful substitution rates.
These aren’t exotic lab materials. They’re industrial byproducts that already exist in large quantities. The challenge is scaling their use consistently across global construction markets, where building codes and industry habits often default to traditional cement mixes.
Carbon Capture at the Source
For processes where CO2 is an unavoidable chemical byproduct, capturing it before it reaches the atmosphere is sometimes the only option. Carbon capture, utilization, and storage (CCUS) technology strips CO2 from exhaust streams and either stores it underground or channels it into other products.
Costs vary enormously depending on the industry and the concentration of CO2 in the exhaust. Capture costs for steel mills range from $8 to $133 per ton of CO2. For cement production, the range is $19 to $205 per ton. Natural gas power plants fall between $49 and $150 per ton. The wide ranges reflect differences in plant design, scale, and how pure the CO2 stream is before capture begins. Plants with more concentrated CO2 exhaust are cheaper to equip.
CCUS is not a silver bullet. At the high end of those cost ranges, it’s prohibitively expensive without policy support. But for certain facilities, particularly cement plants where process emissions can’t be eliminated by switching fuels, it may be essential.
Recycling and Material Efficiency
Using less raw material in the first place is one of the most cost-effective decarbonization strategies, and it’s often overlooked in favor of flashier technologies. Reusing steel beams from demolished buildings, recycling aluminum scrap, and designing structures that need less concrete all reduce the demand for energy-intensive primary production.
The IEA estimates that material efficiency strategies contribute roughly 20% of the total emissions reduction needed for steel, 30% for aluminum, and a striking 70% for cement in a clean technology scenario. For cement, this mostly means designing buildings that use less concrete and extending the lifespan of existing structures rather than demolishing and rebuilding.
Aluminum recycling is particularly impactful because producing aluminum from recycled scrap uses about 5% of the energy required to produce it from raw ore. As vehicles get lighter to improve fuel efficiency (a trend that increases aluminum demand), recycling and reuse become even more important to offset the additional production.
Carbon Pricing as a Policy Lever
Technology alone won’t drive the transition fast enough without financial incentives. Carbon pricing, whether through taxes or cap-and-trade systems, makes emitting CO2 more expensive and tilts the economics toward cleaner alternatives.
Research on carbon tax implementation shows that a tax starting at $10 per ton of CO2 and rising by $5 annually reduced emission intensity at manufacturing plants by an average of 6%. The most emission-intensive plants responded the most, which is exactly the intended effect. Interestingly, when governments recycled the carbon tax revenue back into lower corporate income tax rates, plants invested in more efficient equipment and were able to cut emissions while maintaining or increasing production. The emissions reduction came from producing more output per unit of energy, not from simply making less stuff.
Plants in trade-exposed industries (those competing with international producers who don’t face similar carbon costs) showed the largest responses, both in efficiency improvements and in production adjustments. This highlights a real tension: without border carbon adjustments or international coordination, carbon pricing can push production to countries with weaker climate policies rather than driving genuine emissions cuts.
Combining Strategies for Maximum Impact
No single approach can decarbonize industry on its own. A steel plant might switch partially to hydrogen, power its electric arc furnace with renewable electricity, and source more of its iron from recycled scrap. A cement producer might substitute 40% of its clinker with blast furnace slag, capture CO2 from the remaining clinker production, and work with architects to reduce the volume of concrete specified in new buildings.
The IEA’s Net Zero pathway envisions a world economy that is 40% larger by 2030 but uses 7% less energy. That’s only possible if efficiency gains, fuel switching, electrification, material recycling, and carbon capture all advance simultaneously. The technologies exist or are close to commercial readiness. The gap is in deployment speed, investment, and the policy frameworks that make low-carbon production the default rather than the exception.