Bitcoin is the only project that is running PoW on a higher scale but even with that higher scale it doesn't come anywhere near in the top list that contributes to environmental damage aka climate change and whatever they claim it to be.
Bitcoin mining energy consumption is for a good cause, it enables the processing of Bitcoin transactions, so in the end the energy used for it is worthwhile cause.
Well, it's subjective depends on the individuals and some may claim why we need to spend so much energy when we can simply make it happen with few servers and bank databases but the huge difference is decentralization which they don't understand or they pretend it to be not understanding.
Maybe they should give up their Air conditioned rooms that is consuming more power and to be honest it's such a waste of energy compared to the usability.