Within climatology people like Roy Spencer or Judith Curry. Outside, there's stuff like these papers I posted a couple of days ago.

https://news.ycombinator.com/item?id=36559554

Note the response - yes they may be nuclear physicists or hydrologists but they can't possibly comment on climate, they're the wrong sort of scientists. Also they even say they have a good understanding of science and then define science as "what 99% of experts believe" which is just hilariously medieval.

These are just examples. I can't be bothered trying to draw up huge lists. Other people have done that, it doesn't matter, the crisis true believers just use a circular definition of expert in which if you disagree the world is doomed you can't be an expert, therefore, are not worth listening to.