Is global warming denial more popular among dead scientists than living ones?

I ask this question because I saw a recent one /question/index?qid=20150...

and I started looking at the list of scientists and noticed:

Reid Bryson -- dead

Frederick Seitz -- dead

Robert Jastrow -- dead

Since many of the names I didn't even recognize, I wonder how many of them are dead too. That's not to say that weren't some living scientists on the list, too

Steven Koonin is on there--he used to be chief scientist for BP, and Antonino Zichichi, who is rumored to be head of the Mafia in Erice, Sicily.