I think miners should start invest on renewable energy source (solar panels, wind turbines) to lessen the impact of bitcoin on environment?
If am not wrong,most of the big miners in China are using renewable energy sources for their mining rigs,sure mining is a heavy duty process which consumes a lot of energy and to be frank that is a good thing as it is not cheap to mine a bitcoin and hence it is more worthy to tell that it does cost more to mine a coin than to print fiat currency . 