Some skeptics of man’s contribution to global warming have pointed to lapses in the rise of average temperatures as proof that the phenomenon isn’t taking place. Previous studies focused on changes in air temperature, according to Trenberth, who was the lead author of the 2001 and 2007 UN assessments.
“There are other signs of warming that are abundantly clear,” Trenberth said in an interview. “Those are some of the messages that I think might end up coming out of this report. It’s really strong in areas other than just the global mean temperature or even regional temperatures around the world.”