Not all cryptocurrencies have the same problems. Not all require massive amounts of computational power to "mine". There are many cryptocurrencies (and many o

Not all cryptocurrencies have the same problems. Not all require massive amounts of computational power to "mine". There are many cryptocurrencies (and many of them popular) that don't work on proof of work, and don't require massive amounts of energy to function. This is sort of table stakes knowledge to be able to competently speak about cryptocurrencies at this point.