Dr. Warren Hern has seen the past, present and future of the abortion debate in the United States. The Colorado doctor remembers treating women for illegal abortions, was there for the opening arguments of the landmark Supreme Court case Roe vs. Wade — and now fears what might happen if it’s struck down.Today, Dr. Hern talks about his career.More reading:As a med student, he saw women nearly die from illegal abortions. At 83, he sees no end to his work60 hours, 50 abortions: A California doctor’s monthly commute to a Texas clinicCalifornia plans to be abortion sanctuary if Roe vs. Wade is overturned