When Ethereum completed its much hyped transition from Proof-of-Work (PoW) to Proof-of-Stake (PoS) in September 2022, it looked like it was a new dawn for crypto. Headlines were popping up all over the place, trumpetting how Ethereum had slashed its energy consumption by more than 99.9%. This was a very welcome development as the environmental advocates could finally see a greener blockchain future on the horizon.

However, beneath the marketing glow, there was a more complicated and even darker picture. Yes, PoS has dramatically reduced Etherium’s electricity footprint, however, its long-term impact on centralization, e waste and sustainability may be less virtuous than what was advertised.

PoS fixes some and doesnt fix some

We cannot afford to discredit how PoS eliminated the huge energy draining mining farms from the PoW operations. Reports show that after this merge, Ethereum’s energy usage plummated from an estimated 78 TWh per year under PoW to a mere 0.01TWh. This was according to data aggregated by Digiconomist and reported in the Cointelegraph. In simple terms, Ethereum’s PoW operations used enough electricity to power a few thousand households annually during the PoW period.

However, to call this a green crypto revolution is a bit far fetched. This is because energy is just one part of crypto’s ecological equation.  To be exact, before 2022, Ethereum mining contributed significantly to global e-waste.  This e-waste originated from discarded electronics from obsolete GPU rigs. According to Digiconomist’s Ethereum Energy Consumption Index, PoW based Ethereum generates about 10000 metric tons of e-waste annually. This is the amount of e-waste that a whole country like Luxembourg generates.

While the merge got rid of PoW and energy consumption, the retired machines did not just vanish, they were either trashed or repurposed for other PoW chains like Ethereum Classic or Ravencoin. This energy solution did not solve the e-waste problem.

There is a centralization problem

While PoS is very energy efficient, it also introduces a very dangerous trade off; that is the centralization of power. Let's take it in this way:

For you to become a validator on Ethereum, you need to stake 32 ETH, that is roughly over $100000 in today’s prices. This is a high barrier to entry that will force smaller players into staking pools such as Lido Finance, Coinbase and Kraken. And these staking pools collectively control over 55% of all staked  ETH according to data from CoinDesk in October 2025. In addition, you must also know that Lido alone governs more than 30%.

This concentration of power undermines the original ethos of decentralisation for Ethereum. Instead of full decentralization, a handful of entities now gatekeep the network consensus. This is something that even Vitallik Buterin himself expressed concern about. 

And unlike in mining or PoW, where everyone could theoretically plug in a GPU, PoS favors those with deep wallets and big institutions. Well, this is a very weird circle that crypto is playing if you ask me, after all, centralization led us to the development of decentralization. Now, we are integrating the same centralization that we ran away from, back into crypto?

There are always hidden costs in green capitalism

The PoS integration also ushered in a quieter economic shift. Ethereum’s environmental narrative aligns neatly with Environmental, Social, Governance goals; this is a concept in which major investors have a great interest. However, critics argue that this green narrative is a big marketing cover for financial consolidation, of which I also believe this is the case. 

After all, it’s the large custodians, not individuals that now dominate network control. And the retail users? Well, the retail users subsidize that dominance through fees and lower yields.

Moreover, Ethereum’s carbon performance does not account for upstream environmental costs of manufacturing and disposing hardware owned by staking providers. This includes their servers, networking equipment and specialised data centre infrastructure used to secure the uptime of validators. So, yes I will not be hoodwinked by the green crypto narrative.

Brainwashing green trap

Ethereum’s marketing team deserves credit for rebranding the chain as eco-friendly. But, they cannot call PoS green without addressing validator centralisation and displaced e-waste. Why would they also ignore regional carbon footprints? I see this as misleading the public, if it is no deception at its best.

If we compare this Ethereum green rhetoric with real world sustainability efforts, we would surely find it lacking. After all, even Tesla doesn’t claim that their cars are “zero emission” without acknowledging battery production impacts. So, similarly, Ethereum needs to fit in the full lifecycle of products and services in their chain into their green narrative, not just in article headlines!

Final thoughts and conclusion

Ethereum’s shift to PoS was a big milestone, and there is no doubt about that. But calling it green without the full context is utter deception. True environmental responsibility is not found in headlines, it is found in confronting uncomfortable truths such as e-waste and other processes. After all, in the case of Ethereum, e-waste did not vanish and decentralization was eroded. Also, energy efficiency does not equal sustainability at all if validators run on dirty grids. Crypto is maturing but we must demand transparency, not headlines or slogans. What use is the future of the blockchain without being honest?

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References

1. CoinTelegraph – “Ethereum’s Merge Didn’t Solve Crypto’s E-Waste Problem”
2. United Nations University – “Global E-Waste Monitor 2023”
3. BeaconChain.info – Validator Distribution Data
4. CoinTelegraph – “Staking Pools Are Centralizing Ethereum — And That’s a Problem”
5. CoinTelegraph – “Carbon Footprint of Ethereum Post-Merge Revealed”