I'm no authority on Carson, and I can't tell you if she was completely debunked. I'm pretty sure they went from using DDT like it was candy to a total ban. After that raptors at the top of the food chain apparently had more eggs producing live chicks, but I'm no authority on the matter.
Too much environmental science has been politicized. I'm not sure if there are other better explanations of why eagle populations in particular recovered, but it seems to me they went from the sublime to ridiculous with the total ban of DDT and mosquito borne diseases.
"I'm pretty sure they went from using DDT like it was candy to a total ban."
That's always the problem, the extremeism. We really should strive for a more nuanced approach to a lot of things.