I wonder what can be done about this. These crypto calculations are totally useless RNG and are trashing our planet. One solution I have seen is to charge for power on a non linear scale so for normal users its fairly cheap but if you start to use very high amounts of power it becomes more expensive per kwh. This method doesn't sit too well with me but I don't have any other better suggestions.
You can do something about this: support Proof of Stake crypto-currencies and denounce Proof of Work ones.