No one can deny that amount of energy used for mining is big, but let's face it - there are so many troubles with environment caused by us these days that this is just the tip of the iceberg. Focus on cleaning floating plastic islands and reducing junk. It seems that Bitcoin miners are the main problem of the environment, while eyes are closed for the obvious. Btw, I truly like the way it was pointed out that this is not the real and the biggest problem of mankind and that there are some previous ones that should be addressed.