- Harvard researchers found Bitcoin mining creates harmful air pollution affecting 1.9 million Americans across state lines.
- Bitcoin mines in one state can trigger fossil fuel power plants in another, creating regulatory challenges for cross-state pollution.
- Researchers warn that expanding Bitcoin mining and AI infrastructure could worsen environmental impacts, especially if coal plants remain operational.
A groundbreaking study published in Nature Communications reveals that Bitcoin mining operations produce harmful air pollutants that cross state borders, affecting approximately 1.9 million Americans between August 2022 and July 2023. The research team from Harvard’s T.H. Chan School of Public Health, led by Dr. Francesca Dominici, found these fine particles impact populations far from the mines themselves.
Cities and regions experiencing significant pollution exposure include New York City, Houston/Austin metropolitan area, Northeast Texas, and communities along the Illinois/Kentucky border. The study analyzed data from the 34 largest Bitcoin mining operations in the United States, exposing a complex pollution pattern that crosses state boundaries.
The Cross-Border Pollution Challenge
Researchers discovered that Bitcoin mines frequently increase electricity demand from fossil fuel power plants, creating a domino effect of pollution. “A Bitcoin mine in one state can trigger a power plant in another to burn more coal or gas, sending pollution to another state entirely,” the study explains.
This creates regulatory complications. For example, electricity consumed by a North Carolina mine can increase operations at a Kentucky coal plant, which then degrades air quality in Illinois—leaving affected residents without clear recourse against either facility.
Dr. Scott Delaney, one of the study’s authors, told Decrypt that “possible policy mechanisms” could address cross-state pollution, but “these policies require Federal action.” He specifically suggested the U.S. Environmental Protection Agency could issue a “Good Neighbor” rule for PM2.5 (fine particles) air pollution.
Beyond Cryptocurrency
The researchers note these findings extend beyond just cryptocurrency mining. As some Bitcoin miners pivot from crypto to Artificial Intelligence applications, the environmental concerns remain relevant.
“Bitcoin mines and AI infrastructure both require large data centers, and much of the equipment used to mine Bitcoin tokens can be repurposed for other applications,” Dr. Delaney explained.
The study comes amid increased political support for cryptocurrency mining. President Donald Trump has met with Bitcoin miners during his campaign and expressed a desire for all Bitcoin to be produced in America. Earlier this month, Trump signed an executive order to boost coal production.
The research team warned that continued expansion of Bitcoin mining and AI infrastructure alongside policies extending the lifespan of coal-fired power plants could have severe consequences. If these plants remain operational beyond planned retirement dates, “the pollution they produce will be even more toxic,” the researchers told Decrypt.
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