I knew that "mining" Bitcoins took a lot of energy, increasing global warming and climate change. In fact, it takes so much energy that it is unsustainable as a currency.
According to this analysis, the energy cost of "mining" $1 worth of Bitcoin is 19 Mega Joules, which is almost four times the energy cost of $1 of gold, 5 Mega Joules.
Other metals, such as platinum and copper, have similar energy requirements to gold, but aluminum does stand out with the requirement of 122 Mega Joules per $1 of aluminum produced. Of course, that is why aluminum recycling is so common.
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