Probably the same ‘climate scientists’ who signed those petitions, when the closest they come to being one is that they took a climate module in a geology degree back in 1981 or something.
I do admit to a brain fart above though. It’s been a while since I looked into Christy and this kind of thing. I remember the problems with his baselines, but got the issue the wrong way round. He uses too small a baseline for surface, not atmospheric data.