Recycling's benefits, in numbers
Recycling helps the environment is one of the most repeated and least quantified claims in the industry. For metals it is possible to be specific, because the alternative is well understood: mining ore, crushing it, smelting it and refining it, all of which take large amounts of energy and generate waste. Comparing that with remelting metal that has already been refined shows a large and measurable difference.
The figures below are industry-sourced averages, and the real figure for any particular tonne depends on how it is produced and where. We mark which figures come from a named source and which are widely quoted industry numbers.
Steel: what scrap replaces
| Route to make one tonne of crude steel | Iron ore | Coal | Limestone | Scrap |
|---|---|---|---|---|
| Blast furnace route, from ore | 1,400 kg | 800 kg | 300 kg | 120 kg |
| Electric arc furnace route, from scrap | None (some direct-reduced iron or hot metal may be added) | About 16 kg | About 64 kg | About 880 kg |
These averages come from the World Steel Association's raw materials fact sheet (2018 edition). They show what scrap actually replaces: a steelmaker running an arc furnace on scrap uses a small fraction of the coal and limestone, and most of the iron ore, that the blast furnace route needs. Industry analysis also commonly quotes recycled steel as producing about 58 percent less CO2 and using 60 to 75 percent less energy than steel from ore. We could not tie those percentages to a single primary study, so treat them as indicative.
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Check live pricesAluminium: the biggest saving
| Measure | Primary aluminium | Recycled aluminium | Saving |
|---|---|---|---|
| Energy per tonne (2019 global averages) | 186 gigajoules, mine to cast house | 8.3 gigajoules | About 95.5 percent |
The energy figures are the International Aluminium Institute's 2019 global averages, as reproduced by the Australian Aluminium Council. They are the best-supported number in this guide. Industry sources also quote about 92 percent less CO2 for recycled aluminium, which is consistent with that energy gap but is not tied here to a single study.
The gap is so large because primary aluminium is made by electrolysis, an electricity-hungry process that pulls the metal out of bauxite. Remelting skips that step. Steel's primary route, the blast furnace, is energy-intensive too, but the difference between ore and scrap is far smaller. This is also why aluminium scrap commands strong demand from smelters, as noted in Ferrous vs Non-Ferrous Metals.
Copper: ore that is mostly rock
Copper ore typically runs well under 1 percent copper by weight, so enormous amounts of rock must be mined, crushed and smelted to produce virgin metal. Recycled copper skips essentially all of that. Industry sources commonly quote about 65 percent less CO2 and up to 85 percent less energy, but, as with steel, these are widely repeated figures that we could not trace to one primary study.
How much metal is already coming from scrap
The savings only matter at scale, and for aluminium the scale is large. The International Aluminium Institute's recycling data put the global recycling efficiency rate at 76 percent, with more than 30 million tonnes of aluminium scrap recycled each year (its 2020 release). Market reporting by AL Circle puts recycled metal at about 28 percent of the 100.8 million tonnes of cumulative aluminium consumption in 2024, and a May 2026 consultancy estimate puts it at around 29 percent. Shares differ between sources because they define demand and recycled supply differently, for example on whether scrap generated inside a plant counts, so quote them as approximate.
Beyond carbon and energy
For steel specifically, recycled input is associated in industry analysis with roughly 86 percent less air pollution, 40 percent less water use and 76 percent less water pollution than virgin ore. As above, these are widely repeated recycling-sector figures. Whatever the exact numbers, the direction is clear: mining and smelting do not just cost energy. They disturb land, consume large volumes of water and generate waste rock and tailings that recycled material never produces.
The honest limits of the numbers
Are these numbers exaggerated?
The direction is firmly established and physically sensible, because mining, crushing and smelting ore is more energy- and emissions-intensive than remelting refined metal. But the percentages are averages. The real saving depends on the energy mix of the grid powering the furnace, the quality of the scrap, the distance it travels and the technology used. Collection and transport have their own emissions, and not all scrap can be recycled back to its original quality, because contamination can downgrade it.
The cleaner and better sorted the scrap, the more efficiently it converts, which is one more reason the sorting advice in How to Grade Your Scrap makes economic and environmental sense. For the process the metal goes through after you sell it, see How Scrap Metal Recycling Works, and for how trading it online keeps material in use, ScrapTrade and the Circular Economy.
Where these figures come from
- World Steel Association, raw materials fact sheet, 2018 edition (steel inputs per tonne).
- International Aluminium Institute, 2019 global energy averages (8.3 against 186 gigajoules per tonne) and recycling data from its 2020 release.
- AL Circle market reporting, and a May 2026 consultancy estimate, for the recycled share of aluminium consumption.
- Widely quoted industry figures, not traced to a single primary study: the CO2 percentages for steel, aluminium and copper, and the air and water figures for steel.
If you need a number for a sustainability report, cite the primary source for the specific metal and year, and use the figures here only as a guide to scale.
Frequently asked questions
Are these numbers exaggerated?
The direction is well established, because mining and smelting ore takes more energy than remelting refined metal. The percentages are averages, though, and the real saving depends on the energy mix, scrap quality and distance travelled. The best-sourced figure here is aluminium: 186 gigajoules per tonne for primary against 8.3 for recycled, about 95.5 percent less.
Why is aluminium's saving so much larger than steel's?
Primary aluminium uses electrolysis, an electricity-hungry process, to extract the metal from bauxite. Steel's blast furnace route is energy-intensive but not to the same degree, so remelting aluminium saves far more than remelting steel.
What does recycled steel actually replace?
The World Steel Association's 2018 averages show the blast furnace route using about 1,400 kg of iron ore, 800 kg of coal and 300 kg of limestone per tonne of crude steel, while the electric arc furnace route on scrap uses about 880 kg of scrap with about 16 kg of coal and 64 kg of limestone.
How much aluminium is already recycled?
The International Aluminium Institute reported a global recycling efficiency rate of 76 percent and more than 30 million tonnes of scrap recycled a year in its 2020 release. Market estimates put recycled metal at roughly 28 to 29 percent of aluminium consumption, depending on how it is defined.
Does this apply to every grade of scrap equally?
The direction holds across grades, but cleaner, less contaminated grades convert more efficiently, with less energy lost to separation and reprocessing. That is one more reason grading matters.
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Related reading: How Scrap Metal Recycling Works · ScrapTrade and the Circular Economy · Critical Minerals and Urban Mining · How to Grade Your Scrap