Today, all bitcoin miners consume about as much electricity as is generated by the largest hydro dam in the United States, approximately 6 GW. Also often missing in this relation are reliable estimates of the significant environmental impact and carbon footprint of the traditional financial system, e.g. physical metals extraction.
The still existing lack of trust in crypto currencies may exist due to environmental concerns, particularly amongst those most concerned about issues like global warming. But about 80% of electricity currently used for the Bitcoin mining is already derived from renewable energy what indeed stands in strong contrast to popular market belief.