Things that Apparently Cause Cancer
Short summary
Researchers critiqued Harvard studies claiming nuclear power plants cause cancer deaths by replicating the methodology and applying it to random landmarks—Costcos, baseball stadiums, and colleges all "caused" far more cancer deaths than nuclear plants, proving the statistical approach captures noise rather than actual causation.
- The Harvard studies used "proximity scores" based on distance from nuclear plants (up to 200 km) without measuring actual radiation exposure; nuclear plant workers receive virtually no measurable annual radiation dose, making it physically implausible that distant residents would be harmed.
- When the authors applied the same methodology to other landmarks, Costco alone was associated with 2.2 million cancer deaths (20% of all cancer deaths 2000-2018), private colleges with 1.59 million, and various sports venues with hundreds of thousands each—demonstrating the method produces false positives for anything.
- The studies are ecological associations that don't prove causation, yet the authors built a public health narrative around nuclear plants specifically without testing whether their methodology would generate similar results for unrelated landmarks, a basic quality control step they skipped.
Full summary
Researchers at Harvard published a series of studies claiming that living near nuclear power plants increases cancer incidence and mortality rates. They built their case using a "proximity score" that treats any ZIP code or county within 120-200 kilometers of a plant as exposed, with closer locations weighted more heavily. The authors ran statistical regressions to calculate how many cancer deaths they could attribute to nuclear plants—arriving at figures like 115,586 deaths nationally. The problem: proximity isn't the same as actual exposure. Nuclear plant workers who are on-site receive doses at just 2 percent of occupational safety limits, so the mechanism for how people living dozens of kilometers away would receive measurable radiation goes completely unexplained.
Two researchers replicated the Harvard methodology and then applied it to other landmarks to test whether the approach was actually detecting something real about nuclear plants or whether it was fundamentally broken. The results were damning. Using the exact same statistical method, they "proved" that Costco caused 2.2 million cancer deaths (20 percent of all cancer deaths from 2000-2018), private colleges caused 1.59 million deaths, Harvard University itself caused 111,003 deaths, and living near an MLB stadium caused 944,769 deaths while living near an MLS pitch caused only 50,889. NASCAR tracks, surprisingly, showed a protective effect. Across various landmarks—Superfund sites, state capitals, sports venues—they could account for three-quarters of all cancer deaths in America.
The core issue is that ecological studies show associations at the population level but prove nothing about causation. The Harvard authors hedge by claiming they only found association, not causality, yet their papers are framed as establishing a public health threat from nuclear plants. The methodology has no mechanism to distinguish between real exposure and statistical noise. It's a tool that will find a correlation with literally anything if you run it long enough, making it useless for determining whether nuclear plants actually harm nearby residents.