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%(its between 10%-35% dirty, but lets highball it)
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.(more like 150x-500x)
but do you hear environmentalists complain about the fumes from diesel excavators as they rip up land and dig holes in the environment 109x louder than they shout about bitcoin?