"The long term prediction of future climate states is not possible".
The scenario that burning fossil fuels leads to catastrophe isn't what either scientific group asserts... Lindzen is saying that global warming alarmism provides group 3 with what they want: money, power for the politicians, funding for the environmentalists, and headlines for the media.
Scientists OUTSIDE this area of expertise have capitalized as well.
That's the synopsis. Maybe you should watch the video again. He wasn't discussing the science of it. He broke it down into the groups, where they stood, where they agreed and disagreed, and that the reason it's become a huge deal isn't the scientists who specialize in that field, but group 3 and the scientists (outside that realm) trying to profit from it.
I believe him.