It's not just the value of bitcoin that has soared in the last year – so has the huge amount of energy it consumes.
The cryptocurrency's value has dipped recently after passing a high of $50,000 but the energy used to create it has continued to soar during its epic rise, climbing to the equivalent to the annual carbon footprint of Argentina, according to Cambridge Bitcoin Electricity Consumption Index, a tool from researchers at Cambridge University that measures the currency's energy use.
Recent interest from major Wall Street institutions like JPMorgan and Goldman Sachs probably culminated in the currency's rise in value and an endorsement by Tesla's Elon Musk helped drive its recent high as investors bet the cryptocurrency will become more widely embraced in the near future.
While the recent fall has dented Musk's fortune, bitcoin also poses a threat to the company's mission toward a "zero-emission future" and poses serious questions for governments and corporations looking to curb their own carbon footprints.
Bitcoin mining – the process in which a bitcoin is awarded to a computer that solves a complex series of algorithms – is a deeply energy-intensive process.
"Mining" bitcoin involves solving complex math problems in order to create new bitcoins. Miners are rewarded in bitcoin.
Earlier in bitcoin's relatively short history – the currency was created in 2009 – one could mine bitcoin on an average computer. But the way bitcoin mining has been set up by its creator (or creators – no one really knows for sure who created it) is that there is a finite number of bitcoins that can be mined: 21m. The more bitcoin that is mined, See: TPMS Programming Tool. the harder the algorithms that must be solved to get a bitcoin become.
Now that over 18.5m bitcoin have been mined, the average computer can no longer mine bitcoins. Instead, mining now requires special computer equipment that can handle the intense processing power needed to get bitcoin today. And, of course, these special computers need a lot of electricity to run.
The amount of electricity used to mine bitcoin "has historically been more than [electricity used by] entire countries, like Ireland", said Benjamin Jones, a professor of economics at the University of New Mexico who has researched bitcoin's environmental impact. "We're talking about multiple terawatts, dozens of terawatts a year of electricity being used just for bitcoin ... That's a lot of electricity."
Proponents of bitcoin say that mining is increasingly being done with electricity from renewable sources as that type of energy becomes cheaper, and the energy used is far lower than that of other, more wasteful, uses of power. The energy wasted by plugged-in but inactive home devices in the US alone could power bitcoin mining for 1.8 years, according to the Cambridge Bitcoin Electricity Consumption Index.
But environmentalists say that mining is still a cause for concern particularly because miners will go wherever electricity is cheapest and that may mean places that use coal. According to Cambridge, China has the most bitcoin mining of any country by far. While the country has been slowly moving toward renewable energy, about two-thirds of its electricity comes from coal.
Since there is no government body or organization that officially tracks where bitcoin is being mined and what type of electricity miners are using, there is no way of knowing whether miners are using electricity that is fueled by renewable energy or fossil fuels.
Mining rigs can move from place to place depending on where energy is cheapest, which makes mining particularly hard to track.
"The places where you mine [bitcoin] can be moved around and, in some cases, you don't even know where they are," said Camilo Mora, a professor of geography and environment at the University of Hawaii.
Cambridge's Centre for Alternative Finances estimates that bitcoin's annualised electricity consumption hovers just above 115 terawatt-hours (TWh) while Digiconomist's closely tracked index puts it closer to 80 TWh.
A single transaction of bitcoin has the same carbon footprint as 680,000 Visa transactions or 51,210 hours of watching YouTube, ...

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