'Heat Islands': Study Finds Data Centers May Be Raising Temperatures In Surrounding Areas
Data centers may be creating localized “heat islands,” raising temperatures in surrounding areas by as much as 16 degrees, according to a new study.
The findings add to a growing list of environmental concerns around the rapidly expanding but increasingly unpopular data center sector, which is facing mounting public scrutiny.
A group of scientists from the UK, Singapore and Hong Kong analyzed land temperature data collected over 20 years by NASA satellites in an effort to determine whether hyperscale artificial intelligence data centers are heating up the areas surrounding them.
While their report, published in March, hasn't been peer reviewed and has generated some skepticism, its authors say the results are striking: Ambient surface temperatures increased by an average of 3.6 degrees Fahrenheit after a data center began operations.
In some cases, the change was even more dramatic, driving up temperatures by as much as 16.4 degrees. The study’s findings also indicate it is not just the areas directly abutting data centers that are getting hotter — meaningful temperature increases were found to impact areas more than 6 miles from the data centers themselves.
“Our study shows a non negligible and rather remarkable impact of the AI data centres on their local regions, which is consistent across the data centres worldwide and extends for several kilometers around the AI hyperscalers,” the report’s authors wrote.
“The consistency, scale and extent of these effects lead [us] to think that the creation of local climate zones induced by data centres — that we call the data heat island effect — is real and significant, especially in the context of global warming and climate transformation.”
The study examined temperature data for areas surrounding more than 6,000 hyperscale data centers around the globe. Researchers looked only at data centers in sparsely populated areas and far from other industrial development, an effort to ensure the facilities could be isolated as the sole cause of any changes. The data was also adjusted to account for other external factors such as seasonal impacts and climate change trends.
According to the report’s authors, the dramatic temperature changes they recorded around data centers mirror a recognized phenomenon known as “urban heat islands” in which metropolitan areas become significantly warmer than their surrounding rural areas. These heat islands are caused, in large part, by the replacement of trees and other vegetation with concrete, asphalt and building materials that absorb heat as well as by waste heat produced by cars, air conditioners and industrial activity.
The latter is what the study’s authors believe is responsible for the emergence of data center heat islands, with facilities shedding massive amounts of heat produced by the computing equipment housed inside them. They say this theory is supported by data showing a sharp spike in surrounding temperatures when a data center begins operations.
Beyond the implications of these findings for global climate change, the study highlights potential local impacts for communities near data centers. The researchers say 340 million people live within a 6-mile radius of a hyperscale data center and are therefore exposed to these heat island effects, and that will rise significantly as data center development continues at an unprecedented pace.
“Our results show that the data heat island effect could have a remarkable influence on communities and regional welfare in the future, hence becoming part of the conversation around environmentally sustainable AI worldwide,” the report’s authors wrote. “Given these findings, mitigation measures for data heat island effects warrant urgent consideration.”
The research is already being met with some skepticism, including from other scientists focused on sustainability and climate change. Ralph Hintemann, a senior researcher at the Borderstep Institute for Innovation and Sustainability, told CNN that while the results are eye-catching, the numbers reported in the study “seem very high” and more research is needed to verify the results.
Hintemann also said the issue of heat islands doesn't rank at the top of environmental concerns associated with data centers.
“As far as climate change is concerned, the emissions generated by power generation for data centres remain the more alarming aspect,” he said.
Data center developers are already facing increasingly unfavorable public sentiment and a growing wave of local opposition across the U.S. Fears of rising temperatures could add to a growing list of environmental concerns that are major drivers of pushback to proposed projects.
According to a Quinnipiac poll published this week, Americans oppose data centers being built in their communities by a 65% to 24% margin. A majority of those against local data center development cited environmental impacts as a reason for their opposition, with 64% listing water use and 41% listing noise pollution.
