I have noticed that the discussion about environmentally friendly cryptocurrencies has become much more nuanced. For a long time, crypto was broadly dismissed as an energy guzzler—mainly because of Bitcoin. But the picture has shifted significantly.

The problem with Bitcoin is well known: the proof-of-work mechanism consumes electricity like nothing else. According to Cambridge studies, the Bitcoin network uses about 97 terawatt-hours per year. That’s more than all of Argentina. No wonder many developers have started designing their blockchains differently.

Ethereum is the prime example. After the Merge in 2022, ETH switched from PoW to proof-of-stake—and suddenly, the carbon footprint was reduced by 99.9 percent. This is not just a marketing figure but a fundamental shift. Today, the Ethereum network consumes only about 0.01 terawatt-hours per year. That makes Ethereum one of the leading environmentally friendly cryptocurrencies in the DeFi space.

But Ethereum is not alone. Solana, for example, has worked with a hybrid model from the start—proof of history combined with PoS. An average transaction on Solana consumes only 2,707 joules, less than three Google searches. The network can process 65,000 transactions per second. Solana even collaborates with Watershed Climate to finance CO2 certificates.

Chi (XCH) is even more interesting because it follows a completely different approach: proof of space and time. The network uses free disk space instead of specialized mining hardware. According to Chia data, it consumes 500 times less energy than Bitcoin. The price fluctuates, but the technology behind it is solid.

Avalanche is also impressive—the CCRI report shows that AVAX uses only 0.0005 percent of Bitcoin’s energy. That’s equivalent to the annual consumption of about 46 American households. With 4,500 TPS, the network is also highly scalable.

Algorand and Cardano follow similar principles with pure proof-of-stake. Algorand is even certified carbon-neutral and has partnered with ClimateTrade. Cardano uses Ouroboros and aims for net-zero emissions.

Polygon is an interesting solution as a layer-2 for Ethereum. The network is carbon-negative and has committed to purchasing and gradually destroying emission certificates worth $400,000.

What fascinates me: these environmentally friendly crypto projects did not emerge from moral pressure but from technological necessity. Competition in the crypto space forces developers to become more efficient. Those who are inefficient lose market share.

This has also changed perception. Five years ago, crypto = environmental problem. Today, even traditional investors differentiate between Bitcoin and modern, sustainable alternatives. ESG funds are suddenly interested in Algorand or Cardano.

The numbers speak for themselves: less energy consumption means less CO2 in the atmosphere. And technically, these networks are often faster and cheaper than the old PoW systems. That’s a win-win.

Anyone investing in crypto long-term and wanting to keep the environment in mind should take a closer look at these environmentally friendly crypto projects. On Gate.io, you can view current prices and data—Ethereum is currently around $2,320, Solana at $83.64, Cardano at $0.24. The market is in flux, but the trend is clear: sustainability is becoming the standard, not the exception.