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We know that ionizing radiation has no safe upper limit.

We know that non-ionizing radiation can be harmful at a high enough dose (like sticking your hand in a microwave.)

This research suggests that non-ionizing radiation might not have a safe upper limit, either, only that we haven't totally quantified the damage it causes.

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The microwave causes harm by it's ability to heat water, not by the nature that it's a microwave, doesn't it? Wouldn't we also need to treat any source of heat as similarly dangerous given that it produces infrared radiation?

Wavelength matters - it's the difference between ionizing and non-ionizing. This article seems to indicate that not all of the non-ionizing radiation is harmless.

And heat itself is carcinogenic, yes -- drinking hot beverages is independently associated with a higher risk of mouth, throat, esophageal, and stomach cancer.

Note that this isn't research; it's an opinion piece that doesn't really cite anything, except vaguely. It's at least two levels removed from the research – it seems to be a summary of a meta-analysis.

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