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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11There is no single carbon footprint for an NFT. Emissions depend on the blockchain and its electricity supply, which activities are counted, and how shared network emissions are assigned. Ethereum’s current network-wide estimate is far lower than figures from its proof-of-work era—but it is not a measurement of the footprint of one NFT.
What determines an NFT’s carbon footprint?
An NFT is a token recorded on a blockchain; it does not specify which blockchain or how that network operates. The environmental accounting usually concerns electricity used by blockchain infrastructure and the greenhouse-gas emissions associated with that electricity. Depending on the analysis, it may also include activities such as minting, transfers, sales, settlement, bridging, or Layer 2 systems.
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Estimates can differ because they draw the boundary around different activities and systems. They also depend on consensus operations, node hardware, the electricity mix, regional carbon-intensity assumptions, and how shared network activity is allocated. The OECD identifies consensus mechanism as a major factor in digital assets’ energy impacts (OECD, “Environmental impact of digital assets,” 2022).
Why one-NFT and per-transaction figures can mislead
A network-wide annual estimate is not the footprint of a single NFT. Dividing a network’s electricity or emissions by its transaction count produces an allocation convention, not a direct measurement of the extra energy caused by minting or transferring one token.
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Ethereum.org explains that the electricity required to propose and validate blocks does not rise in direct proportion to the number of transactions in those blocks. The result of a per-transaction calculation also depends on which transactions are in the denominator. In particular, Ethereum’s page notes that Layer 2 rollups add transactions and are often omitted from such calculations (Ethereum.org, “Ethereum Energy Consumption,” accessed 2026).
For a per-transaction number to be meaningful, its publisher should specify the network, date, activities included, transaction denominator, treatment of Layer 2, electricity mix, and accounting method. Without those details, figures from different sources may not describe comparable things.
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Ethereum’s current estimate—and what it covers
Ethereum.org currently estimates that the whole Ethereum network uses 2,601 MWh of electricity and emits 870 tonnes of CO2e annually. The figures are based on bottom-up work by the Crypto Carbon Ratings Institute (CCRI), which measured node electricity across different hardware and client configurations; the emissions estimate applies regional-specific carbon-intensity factors. These are network totals, not NFT-only estimates or a footprint per NFT (Ethereum.org, “Ethereum Energy Consumption,” accessed 2026).
Electricity use and carbon emissions are related but not interchangeable: the same quantity of electricity can have different associated emissions depending on how it is generated. Ethereum.org cautions that electricity consumption does not map precisely to environmental footprint because energy sources differ.
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How Ethereum’s 2022 Merge changed the comparison
Ethereum switched from proof of work to proof of stake in 2022. Under proof of work, miners expended energy to propose blocks; under proof of stake, validators participate using staked assets. Historical Ethereum figures from the proof-of-work period should not be presented as current network conditions.
CCRI estimates reported by Ethereum.org put the Merge’s reduction in Ethereum’s annualized electricity consumption at more than 99.988%, and the reduction in its carbon footprint at approximately 99.992%. The reported emissions estimate fell from 11,016,000 to 870 tonnes of CO2e. These are estimates for the Ethereum network, not measured reductions in the footprint of NFTs specifically (Ethereum.org, accessed 2026; Ethereum.org, “Proof-of-stake (PoS)”).
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What NFT-specific studies estimate
A peer-reviewed 2023 study modeled possible emissions for the NFT sector under post-Merge assumptions. Its abstract estimates yearly NFT greenhouse-gas emissions could reach up to 18% of the peak under Ethereum’s former proof-of-work algorithm, and models cumulative carbon debt of 4.56 Mt CO2-eq by the end of the decade. Both figures depend on the paper’s scenarios and assumptions; they are projections, not a measured present-day NFT inventory (“Climate concerns and the future of nonfungible tokens: Leveraging environmental benefits of the Ethereum Merge,” 2023).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare blockchains or NFT options
A lower network-level energy estimate does not, by itself, prove that an NFT on one chain has a lower lifecycle footprint than an NFT on another. A useful comparison needs consistent boundaries, dates, and accounting methods.
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- Consensus: Identify whether the chain uses proof of work, proof of stake, or another mechanism, and make clear which version or period the estimate describes.
- Activities counted: Check whether the figure includes minting, transfers, sales, settlement, bridging, validator or node operation, and Layer 2 sequencing.
- Type of figure: Distinguish network-wide totals from per-transaction allocations and NFT-specific results; label measurements separately from models and projections.
- Electricity and emissions: Look for the electricity mix and geographic carbon-intensity assumptions, not just energy consumption.
- Comparable boundaries: Confirm that the chains are assessed using the same system boundaries and dates before treating their numbers as a ranking.
CCRI’s 2023 comparison of proof-of-stake networks and platforms provides context on electricity and carbon estimates and calls for continued monitoring and disclosure. It is a network benchmark, not a like-for-like study of NFT lifecycle footprints (CCRI, “Energy Efficiency and Carbon Footprint of PoS Blockchain Networks and Platforms,” 2023).
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