The use of bitcoin causes around 22 megatons in CO2 emissions annually — comparable to the total emissions of cities such as Hamburg or Las Vegas. This was the conclusion reached by scientists who have carried out the most detailed analysis to date of the cryptocurrency’s carbon footprint.
For the study, an interdisciplinary team of researchers at the Technical University of Munich (TUM) analyzed data such as the IPO filings of hardware manufacturers and the IP addresses of bitcoin “miners.” Their paper was published online in the international journal Joule on June 12, 2019.
Although a bitcoin is a virtual currency, the energy consumption associated with its use is very real. For a bitcoin transfer to be executed and validated, a mathematical puzzle must be solved by an arbitrary computer in the global bitcoin network. The network, which anyone can join, rewards the puzzle solvers in bitcoin. The computing capacity used in this process – known as bitcoin mining – has increased rapidly in recent years. According to statistics, it quadrupled in 2018 alone.
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Consequently, researchers are raising questions the cryptocurrency is imposing an additional burden on the climate. Several studies have attempted to quantify the CO2 emissions caused by Bitcoin mining. “These studies are based on a number of approximations, however,” said Christian Stoll, one of the authors of the study, in a press release.
Tracking down power consumption
Therefore, a team of management sciences and informatics researchers at TUM has carried out the most detailed calculation of the carbon footprint of the bitcoin system to date.
The team had to proceed step by step to gather conclusive data. They began by calculating the power consumption of the network. This depends primarily on the hardware used for bitcoin mining. “Today special systems are used, known as ASIC-based miners,” explained Stoll, who conducts research at TUM and the Massachusetts Institute of Technology (MIT).
In 2018, the three manufacturers who control the ASIC miner market planned IPOs. The research team used the mandatory IPO filings to calculate the market shares of the companies’ respective products. The study also had to consider whether the mining was being done by someone running just one miner at home or in one of the large-scale “farms” set up in recent years by professional operators.
“In those operations, extra energy is needed just for the cooling of the data center,” noted Stoll.
To investigate the orders of magnitude involved, the team used statistics released by a public pool of different miners showing the computing power of its members.
‘68 percent of computing power located in Asia’
The researchers determined that as of November 2018, the annual electricity consumption by Bitcoin was approximately 45.8TWh. Now the question arose about the amount of CO2 emitted when this energy is generated. Here, too, the research team wanted to go beyond mere estimates. The key question therefore was: Where are the miners located?
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Live tracking data from the mining pools provided decisive information again. “In these groups, miners combine their computing power in order to get a quicker turn in the reward for solving puzzles – similar to people in lottery pools,” explained Stoll. The IP addresses in the statistics published by the two biggest pools showed that miners tend to join pools in or near their home countries. Based on these data, the team was able to localize 68 percent of the Bitcoin network computing power in Asian countries, 17 percent in European countries, and 15 percent in North America. The researchers cross-checked this conclusion against the results of another method by localizing the IP addresses of individual miners using an internet of things (IoT) search engine. They then combined their results with statistics on the carbon intensity of power generation in the various countries.
The study concluded that the bitcoin system has a carbon footprint of between 22 and 22.9 megatons per year. These figures are comparable to the footprint of cities such as Hamburg, Vienna or Las Vegas.
“Naturally there are bigger factors contributing to climate change. However, the carbon footprint is big enough to make it worth discussing the possibility of regulating cryptocurrency mining in regions where power generation is especially carbon-intensive,” said Stoll. “To improve the ecological balance, one possibility might be to link more mining farms to additional renewable generating capacity.”