Hey thats a great question that I hear almost anyone who wants to go into a fellowship in any subspecialty ask. For critical care like most fellowships except ultrasound, the involvment takes you outside of the ED. Tox, EMS, Critical Care Global Health, Informatics, all take you to a secondary place of practice.
I think most CC-EM docs work in academic centers, unless you find an amazing community job where they are employed part time in both groups (cc group and the EM group). Very few do Pulmonology clinic. Very few work in a setting like Dr. Weingart has where there is a critical care section of the ED. Hope that helps.