Proper research that refers to sources that you can check etc. Has discovery channel ever presented any criticism to global warming. If they have it is just as a strawman.
Why does global warming deserve to be criticized? Does any serious, professional and reproducible research refute it?
I have read a lot of the propaganda against the science. There is nothing behind it. Like that list of "scientists" that don't belive in global warming turns out to be regular people.
Those phD's aren't in a relevant field. Their opinions are worthless. Research and data are what matter. It was not a narrative change. Just that it involves more than than warming.
It can be more complicated then that though. The issue is the excess energy in the system due to an albedo imbalance. The extra energy usually is noticed as more heat, but not always.