This guy is no expert..... we all know the Earth is experiencing climate change.... if he were an expert he’d know that, and wouldn’t be using the phrase, “global warming”.
Sheesh! /s
The earth has experienced warming in the latter part of the 20th Century which, as you say, is part of the normal cycle. There is nothing wrong with how he expressed it because he makes it clear that he was concerned that it was man made until the facts showed otherwise.