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Blockchain is perfectly fine. Its specifically certain crypto thats the issue as they use up to much energy for what they do. So for example bitcoin uses the energy intensive proof of work but then also artifically inflates its value such that it will always take more energy to make one as time goes by. So the amount of bit coins you could mine per barrel of oil was way less in 2010 in comparison to now and not just as a function of inflation. Regardless of that the proof of work is to energy intensive. Grid coing uses proof of stake and the computation is used to do useful work. So like im fine with that. blockchain is ultimately a distributed ledger which is fine but bitcoin was a poc of a possible use and unfortunately the creator did not realize the issues it would have energy wise if it was actually used as a form of currency. Bitcoin makes the k-cup guy look like the patron saint of environmental responsibility.