The problem of the carbon footprint of Bitcoin mining, raised by Elon Musk, is in many ways far-fetched. Miners are not looking for carbohydrate energy sources. They consume the energy that the government of the country supplies them centrally. However, in any case, the problem has been raised and it must be solved, and here the solution may be in the transition of cryptocurrency to a proof-of-stake algorithm. In this regard, the ethereum network is updated in a very timely manner, including in this regard. Therefore, the popularity and price of this coin should increase significantly.