Widely debunked? It's completely debunked. He made predictions about population that didn't come true.
Ehrlich hasn't been right about anything in his professional life ever. But showing one of the fundamental defining characteristics of a liberal he has repeatedly failed to learn from his mistakes and keeps doubling down on error. Ehrlich is a joke, but when I suggested this to one of my former academic colleagues, he told me he no longer wanted to speak with me. No loss to me.