Bitcoin climate impact greater than gold mining, study shows

theguardian.com:

Bitcoin is less “digital gold” and more “digital beef”, according to a study that suggests the cryptocurrency has a climate impact greater than that of gold mining and on the level of natural gas extraction or rearing cattle for meat.

The research from the University of New Mexico, published in the journal Scientific Reports, assessed the climate cost of various commodities as a portion of their overall market cap.

Some, such as coal, cause almost as much damage as the entire value of the market they support, a 95% ratio, according to the analysis. Other commodities, such as pork production, generate huge climate impacts in absolute terms but only because the market is so massive.

Bitcoin, however, lies in between the two. According to the economists, the climate damage of producing the digital currency has averaged 35% of its market value over the past five years, peaking at 82% in 2020.

That is comparable to beef, which causes harm equal to 33% of its market, or natural gas, which hits 46%. And it is far in excess of gold, the commodity that the cryptocurrency’s backers most compare it to, which has a climate impact of just 4% of its market value, thanks to its enormous overall value dwarfing the large environmental impact of its extraction.

The digital currency’s disproportionate harm to the climate comes from its reliance on a computing process to verify transactions called “proof-of-work mining”, which requires huge electricity expenditures to participate, rewarding those who carry it out with the chance to win some new bitcoin.

On more than one day of 20 in the period the researchers examined, the climate damage from these “bitcoin miners” exceeded the value of the coins produced, overwhelmingly due to that electricity