. . .
Bitcoin is on the order of 2.5 Million times less efficient than Visa. 2.5 Million.
. . .
I assume this mighty number comes from the openly anti-Bitcoin Digiconomist article.
For an alternative openly pro-Bitcoin interpretation, see What Bloomberg Gets Wrong About Bitcoin's Climate Footprint.
Lots of agendas here and I suggest that scepticism should be liberally applied to both sides of the argument.
No. This "both sides" thing is, itself, pretty gross Crypto propaganda. The author of this article is Nic Carter—a venture capitalist with colossal investments in crypto. In traditional journalism, having investments in companies bars you from writing about those companies. That is a conflict of interest. Nic Carter's rebuttal here is pure nonsense. I really encourage people to read it to see the childish mental gymnastics he does to try to sow doubt about actual good journalism.
Editing to actually add some reasons I think Nic Carter's article is nonsense- Nic is mad at the per-transaction number. Fine. Look at the entire system's footprint. It uses more electricity than the entire country of Argentina. That the per-transaction number is astronomical simply highlights that this huge carbon footprint is for a pretty minimally-used side-hobby for some very niche libertarian computer-nerds. Let's think about this even more. By fairly generous estimations, there are ~80M people who own Bitcoin (only about 400k daily users, but anyway). There are 45 Million people living in Argentina. In other words, 45 Million people live their entire lives (including mining some bitcoin, flying to far away lands, etc.) on
less energy than it takes to support a play-thing very casually used by ~70% more people. That is grotesque. Vulgar. Obscene.
- Nic claims that the comparison is unfair, because Bitcoin is a complete network, and Visa relies on banks and settlement systems—whose systems are (allegedly?) not included in the Visa energy calculations. This is hardly true in practice. Virtually every user of Bitcoin uses a Bitcoin exchange, expects to convert it back-and-forth with USD (or their own local currency), etc.
- Nic tries mightily to suggest that oil backs the USD (and somehow not Bitcoin?) There's no coherent explanation why—just lots of hand-wavy thought-terminating nonsense.
- He argues that Bitcoin transactions are of higher value transfers than Visa ones?!?! Computers do not care whether they're sending the binary sequence for $1 or $1B. It's the same cost. This is irrelevant.
- He argues that in the future things will be better because the block rewards will diminish! He then arbitrarily chooses transaction count and a weird $10 fee to make his point. He made those numbers up based on nothing other than making his argument make sense. (Plus, y'know, let's stick to the topic of *today*. CO2 released today is still relevant, Nic)
- He tries to suggest that much of Bitcoin mining uses renewable energy! This. Is. Not. How. Electrical. Grids. Work. Electricity is fungible. Electricity wasted on mining bitcoin is energy that could have been used for something useful elsewhere. Plus, it's just not true (as many of the sources below will show). Bitcoin mining tends to happen most where it's cheapest. Coal tends to be a very cheap source of energy throughout the world. Nic's argument is the financial equivalent of buying a TV with your income tax refund because, hey, it's just your income tax refund! FREE MONEY
In sum, this is a pretty weak argument. For what it's worth here are several more sources for Bitcoin's environmental impact, if you're interested:
https://ieeexplore.ieee.org/document/9385063https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3779720https://www.sciencedirect.com/science/article/abs/pii/S2214629619305948?via%3Dihubhttps://arxiv.org/pdf/2112.01238.pdfhttps://ccaf.io/cbeci/indexAside: I'm a software engineer. I have a Computer Science degree. I'm intimately familiar with code efficiency and how to at least estimate it (SUP BIG O NOTATION?). And I cannot emphasize this strongly enough: traditional financial systems are written in code attempting to be efficient. Bitcoin is
purposefully wasteful. The mechanism by which it is secure against malicious miners, is to have them each deliberately waste computational time, guessing numbers, such that it would be too costly to cheat. Each miner is significantly less efficient than something like a Visa network. But remember: there are millions of bitcoin miners. It isn't very difficult to assess the magnitude in difference between Visa and Bitcoin—though people have done very deep investigative work, and found the ~2.5 Million x to be accurate.