From the NY Times
> "Dr. Broecker could be combative and even curmudgeonly, recalled Michael E. Mann, a climate scientist at Pennsylvania State University. “He was quite opinionated and often fought hard to make his scientific interpretations the prevailing doctrine,” he said.

From what I have read, Broecker modeled the climate system as an "angry beast", with the meaning that it was highly unpredictable. I wonder if this was the scientific interpretation that he was trying to convince people of.