It might have been Mark Twain who said, or at least repeated, that a lie will get halfway around the world while the truth is still putting on its pants. And that expression finds no better example than the way water usage by data centers has been portrayed over the last couple of years.
I live in Texas, which has seen some of the most rapid growth of data centers in the U. S. There has even been a local controversy here in San Marcos, with citizen groups organizing rallies and protests against the construction of new data centers. Every day when I go on my bike-exercise route, I pass two or three signs saying "No Data Centers" showing a big faucet with a single drop of water coming out. Unfortunately, that sign represents about the typical level of discourse that prevails in discussions about the environmental concerns raised by data centers, specifically their water use.
Last May, a book by Karen Hao, Empire of AI, hit the market and received a wildly enthusiastic reception. Amazon currently ranks it the No. 1 best seller in International Economics and No. 3 in General Technology and Reference, a very broad category. It won the National Book Critics Circle Award in 2025.
And yet it contains numerous factual errors, many of which blogger Andy Masley pointed out in detail in his Substack blog over a period of months. In discussing plans Google had for a data center in a town in Chile, Hao wrote that the data center would use 1,000 times more water than the city of 88,000 used.
Masley, a close reader of the technical stuff in such a book, thought this looked strange, although it is not out of line with similar claims by others for the vast quantities of water that data centers will supposedly use. So he looked into the problem.
When he took the number that Hao said was the city's total water usage and divided it by the population of 88,000, he got the result that each citizen was using less than a half-cup of water (0.2 liters) per day. That is nonsense, of course. When he found the original data, it turned out that the city's consumption was stated in cubic meters, not liters. As later confirmed by Hao, someone on her staff of assistants mistook the cubic-meter consumption for liter consumption.
As every student of the metric system knows, one cubic meter contains 1,000 liters, hence the error by a factor of 1,000.
What Masley then wanted to know was how such an egregious error made it past the fact-checkers acknowledged in Hao's book, and the more than 1,000 reviews on Amazon, the adulatory comments in prominent media outlets such as the New York Times and The New Yorker, and the people who decide on the National Book Critics Circle award.
The only answer he could come up with is that the people writing the reviews don't give a flip about numbers. And the people who care about numbers don't write book reviews, except for him, evidently.
Hao has since admitted that the error happened in the manner Masley suspected. But that's a little bit like apologizing for not wiping your feet on the welcome mat after you burn your host's house down. Masley has spent what amounts to a fulltime job calling out and correcting this and innumerable other errors in the vast outpouring of what may well be called propaganda opposing the construction of new data centers. His words are finally gaining some traction in the media, which is why I now know about his work.
But something is way out of whack with public discourse if one side of a controversy can put out tons of material that is chock-full of factual errors, and these errors can go unchallenged for months or years before one person with the willingness to do the math and find and expose the errors gets enough attention to be heard from.
This story reveals laziness and groupthink among those who control prominent media outlets, plus something that could be called math avoidance. You would think that at a time when mathematics has never been as vital an underpinning to civilization as it is now, that most people would be at least somewhat used to doing math when some issue that vitally involves math comes up.
But this story about liters and cubic meters shows that a lot of people who should do their math homework before blatting the glories of a book, or taking sides in a controversy, simply don't. They find an expert whose vibes agree with their own and enthusiastically fall in line without the slightest regard for accuracy or healthy skepticism.
I don't know what the future of data centers holds. Their wild growth is starting to look to me like some sort of bubble, much as we had a wild growth of fiber-cable capacity in the early days of fiber-optics, and for years the industry contended with the problem of "dark fiber"—too much capacity. Dark fiber cables don't use water or power—they just lie there. But data centers need both, and it's possible that we may find ourselves awash in surplus data-center capacity and the boom will become a bust.
But so far, there seems to be no limit to the appetite for "compute," as the experts call it, that AI wizards have. The only limit at this point will be economic. If the people who build the capacity can't figure out how to make money with it, they'll eventually quit adding capacity. But as long as the public and corporations are willing to get more AI results—and so far, they are—the demand will drive the supply and more data centers will be built.
That is, unless people keep on believing the nonsensical claims of the more extreme opposition to data centers, and do something like getting a nationwide ban on new construction passed. Then we'll get to see what a data-center shortage looks like, and it might be worse than you think.
Sources: Numerous news outlets have covered Andy Masley's debunking efforts directed at correcting errors in the claims of data-center opponents. The details of the particular Empire of AI error described herein can be found at his Substack post https://blog.andymasley.com/p/empire-of-ai-is-wildly-misleading.