IARC, the organization that produced this mess is doing science communication a massive disservice and it should be reformed. They call category 2B "possibly carcinogenic" when in reality the evidence required for category 2B is basically anything that is as flimsy and hypothetical as possible. No one would refer to anything in category 2B as "possibly carcinogenic" in daily life. At best you might say this category is "worthy of potential future study".

Their poor communication creates hype and hysteria while discrediting scientists everywhere.

A few years ago they said "Radiofrequency electromagnetic fields are possibly carcinogenic to humans (Group 2B)." https://publications.iarc.fr/126

The reasoning for this is on page 419. They classified radio as possibly carcinogenic because prior studies weren't as well controlled as they wanted, some analyses they wanted weren't done, and because one very small study that saw a minor correlation that isn't at all consistent with the population level data that we have (which says there's no association).

That's it. All of this hype for absolutely nothing.

IARC needs to be fixed.