to add to this.
gold uses 100% dirty fuel (diesel for excavators and sluice machines)

at a cost of $900 per ounce
mining 97003000 ounces a year
= $87,302,700,000 of dirty energy spend

lets go with a low average rate of non renewable energy spend on bitcoin mining of 50%
well it costs about $183,746.45 an hour in electric at $0.04/hwh
=$1,609,618,902
so thats $800m bitcoin dirty spend vs $87bill gold dirty spend

gold mining is 109x more dirty than even a conservative estimate of mining bitcoin