Third generation cryptos like Cardano/Ada, Polkadot and others using proof-of-stake instead of proof-of-work to generate new blocks are orders of magnitude less energy demanding and more efficient in terms of transaction speed and costs than bitcoin and ethereum. Bitcoin has, unfortunately, become synonymous with cryptocurrency in many people's minds. It will be interesting to see what happens with the value of bitcoin as these limitations relative to the new kids on the block (sorry, pun intended, showing myself out the door etc.) become more obvious.