Bitcoin’s Carbon Footprint May Not Be As Massive As Previously Estimated

Whether Bitcoin, an immaterial resource derived from hype and blind faith, will vanish into thin air is uncertain, but it will leave behind a dark cloud of carbon pollution. Cryptocurrency mining facilities use so much energy that the government of Abkhazia cut power to 15 mining centers last year. A Norway Parliamentary representative has called Bitcoin, in particular, the “most dirty form of cryptocurrency output.” Some researchers have estimated that Bitcoin alone could push us over the critical two-degree celsius threshold.

But a new study shows that its carbon footprint is not as big as we thought! Moderately good news for a thing typically generating headlines of hacks, bubbles, thievery, money laundering, anonymity failures, scammers, and more scammers.

Digiconomist, the data project behind the widely-cited Bitcoin Energy Consumption Index, has estimated that the Bitcoin mining network generates 34.73 megatonnes of carbon dioxide per year, comparable to Denmark; this study puts it at a more modest 17.29 megatonnes in 2018. (For a middle ground, see this study from June that estimated an annual output of 22.9 megatonnes of carbon dioxide from bitcoin mining.) The new finding paints a less-horrific picture, but it’s still nearly as much as the city of Vancouver. The computational hardware to mine Bitcoin packs a lot of muscle, as miners furiously race to automate the solution to complicated equations—the first person with the solution gets the freshly minted bitcoin.

Unlike previous studies, co-author Susanne Köhler told Gizmodo that they factored in both the efficiency of mining equipment and fossil fuel dependency in various locations, based on the number of tries to mine a block there. We know that Bitcoin is heavily mined in China, for example, which generates more electricity from coal than any other country in the world. (And is adding much more, despite its promises.) But rather than basing calculations on China’s overall carbon output, they…

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