- Manufacturing accounts for around 80 percent of a smartphone's lifetime carbon, use accounts for around 15 percent.
- A refurbished phone avoids the manufacturing footprint of a new device, saving 45 to 55 kg CO2 equivalent.
- Battery and screen replacements add roughly 5 to 10 kg of replacement carbon, but the net saving still dominates.
- Carbon savings only get realised when refurbished devices are actually purchased, not when they are simply available.
- Wholesale infrastructure that moves stock efficiently is the leverage point, not consumer behaviour change.
Where the carbon in a smartphone actually sits
Apple, Google, and Samsung all publish lifecycle assessments for their flagship phones. The numbers cluster tightly. An iPhone 15 Pro carries roughly 66 kg CO2e over its full lifecycle, of which about 79 percent is in production, 17 percent is in customer use, 3 percent is in transport, and under 1 percent is in end-of-life. A Pixel 8 lands at around 60 kg with a similar breakdown. A Galaxy S24 sits at about 56 kg with the same proportions.
The dominance of production over use is not intuitive but it is consistent. The chip fabrication, the rare earth element extraction, the display manufacturing, the assembly, all of it is energy-intensive in ways that drawing 5 watts off a wall socket for charging cannot match.
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What refurbishment actually saves
Refurbishment avoids the production footprint of a new device. If a refurbished iPhone replaces what would otherwise have been a new iPhone, the buyer avoids the roughly 52 kg of production carbon, leaving them with the use-phase emissions plus a small refurbishment cost.
Refurbishment is not free in carbon terms. A new battery costs roughly 4 to 6 kg CO2e to manufacture and ship. A new screen costs roughly 3 to 5 kg. Disassembly, testing, and packaging together add maybe another 1 to 2 kg. Net out, refurbishment carries a footprint of around 8 to 12 kg per device. The net saving versus a new device is therefore around 40 to 50 kg per refurbished phone that displaces a new one.
The displacement question is where the math gets honest
A refurbished phone only saves carbon if it actually replaces a new-phone purchase. If a buyer would not have bought a new phone anyway, the refurbished purchase is additive demand, not displaced demand, and the carbon math is much smaller. Industry estimates put displacement rates at 60 to 80 percent for refurbished smartphones in mature markets.
Why the wholesale market is the leverage point
The carbon savings only show up when refurbished devices reach buyers. A refurbished phone sitting unsold in a refurbisher's warehouse is not displacing anything. The constraint on the refurbished market is not consumer interest, it is supply-side efficiency, the ability to get refurbished stock from the refurbisher to the retailer to the buyer at competitive prices.
That makes the wholesale infrastructure the actual leverage point for carbon savings at scale. Better visibility into available stock, faster matching between refurbishers with inventory and retailers with demand, lower cost of finding counterparties, all of it compounds into more devices moved, more devices sold, more new-device purchases displaced.
What this looks like in numbers, at industry scale
Estimates vary, but the IDC and Counterpoint Research figures cluster around 280 million refurbished smartphones sold globally each year. At 45 kg CO2 saved per displaced new-phone purchase, with a 70 percent displacement rate, that is roughly 8.8 million tonnes of CO2 avoided per year, equivalent to taking around 1.9 million petrol cars off the road for a year.
The growth rate matters more than the absolute number, and published growth figures differ because they measure different things in different years. Counterpoint Research reported that global refurbished smartphone sales grew about 3 percent year on year in the first half of 2025, ahead of mature-market new-phone demand. IDC, forecasting units rather than sales in a single half-year, put used-smartphone shipments on a 10.3 percent compound annual growth rate across 2021 to 2026 in its January 2023 outlook. Every percentage point of growth in displacement rate translates into another 100,000 to 150,000 tonnes of CO2 avoided.
Where the marketing claims overstate the case
Two things to be careful about. First, many marketing claims quote production-only figures and present them as total lifecycle savings, which inflates the number by 20 to 30 percent. Be specific about what is included. Second, claims of 80 to 90 percent carbon saving versus new phones implicitly assume 100 percent displacement, which is unrealistic. The honest range is 50 to 70 percent net lifecycle saving once displacement is properly weighted.
None of this changes the bottom line, refurbished beats new on carbon by a wide margin. It just means the precise number depends on what assumptions you build in, and those assumptions matter for credible reporting.