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Crypto: Here’s how many Visa transactions can be completed using the energy to mine one bitcoin

The environmental issues surrounding bitcoin are known, but this statistic from a recent Deutsche Bank report is jarring.

According to Marion Laboure, a Deutsche Bank analyst, mining one bitcoin
BTCUSD,
+0.39%

consumes a larger carbon footprint than nearly two billion Visa
V,
+1.15%

transactions. Another incredible stat: an individual bitcoin transaction could power the average U.S. household for 61 days.

Adding in the energy consumption of Ethereum
ETHUSD,
-1.87%
,
and the two major cryptocurrencies would rank 15th in the world, nearly equivalent to Mexico.

And while there have been moves to push cryptocurrency activity to renewable sources, about three-quarters of bitcoin’s global energy consumption is generated from non-renewable sources, says Laboure.

She notes that regulators are moving to address the environmental impact of cryptocurrency. The European Parliament, for instance, has proposed requiring companies to disclose the energy consumption related to crypto activities. The Crypto Climate Accord is a private-sector attempt to address the issue.

She suggested four ways to decarbonize cryptocurrencies. One would be to push the cryptocurrency industry toward renewable sources, such as geothermal energy. El Salvador has started using geothermal energy from volcanoes, Another would be a carbon tax, that would hit large consumers of carbon-fuelled energy.

A third idea would be switching to proof-of-stake, rather than proof-of-work, protocol for verifying transactions. “Proof-of-stake consumes less energy than proof-of-work, but it is less secure and it centralizes mining power among users who have already mined the most cryptocurrency,” Laboure said. Ethereum moved to such a system in October. Another idea is to handle more bitcoin transactions off the blockchain, such as through the Lightning Network.

A fourth idea would be so-called pre-mining, where all the tokens would be issued at once. There’s issues with this approach, though. “The cryptocurrency’s creators could stockpile tokens for themselves, thereby artificially driving up the cryptocurrency’s value before selling their hoard. By gaming the system, they would generate distrust and cause extreme price volatility—a problem that already plagues cryptocurrencies due to their illiquidity,” said Laboure.

According to CoinMarketCap, the market value of cryptocurrencies on Friday was $2.25 trillion.

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