I found the following whitepaper on an algorithm called "Green-PoW" by the authors and i’m quite sure this would be a perfacet solution and also would get acceptance by the miners and the community.
You can find the white paper here: https://arxiv.org/pdf/2007.04086.pdf
Key point of the paper here as a quote:
"In order to reduce the energy consumption in PoW, Green-PoW considers mining rounds in pairs and adjusts the election mechanism during the first mining round in the pair, to allow the election of a small subset of miners that will exclusively mine in the second round. Assuming the total network hashing power is equally distributed among miners, a significant energy saving up to 50% could thus be achieved"
What is your opinion on this approach, are there any problems with this?