For me, the big deal is the “forever” nature. These chemicals will continue accumulating in the environment, in the food chain, in people’s bodies, essentially forever. They don’t biodegrade and they’re getting ubiquitous enough that you couldn’t clean up the contamination if you had to.

I also worry that it’s not a chemical, but a large class of chemicals. There are many variations and they have not been individually evaluated.

And there have been studies showing harm in animals, including harm when the accumulation in a creature gets large enough to physically interfere with things.

Those all add up to enough risk that we really need to cut back