We are using the bitcoin on our transactions because it is easier, faster and secured and even we already have a lot of benefits using the bitcoin still it has an impact to the environment first is the miners you already stated because miners use an electricity too because they are mining with the use of their computers and some of them are using those computers for 24/7 just to mine a lot of bitcoin it has a lot of consumption of the electricity and where do resources come from it is from our natural resources. If you are in a country which has a low electricity bill it is good for mining but if you aren't don't attempt to mine because the bills are higher than your earning but still it is on your decisions. Also, we have cloud mining today you can use this to mine too.