Ethereum 2.0 isn’t expected to be released until 2022, 2023, or 2024*
If you’re looking for something that works now, you can take a look at the 3rd most popular cryptocurrency on Coinbase, Stellar Lumens (XLM). It sure is energy efficient.
More details here: https://www.reddit.com/r/Stellar/comments/nbqfey/since_co2_e...
Sources: *Coinbase, Stakewise