This group, the UN's IPCC doesn't even conduct it's own studies. They review papers published by others.
The Chair of the IPCC is a documented Exxon-hater, Rajendra K. Pachauri. He advocated a boycott of Exxon based on their climate views, and because it would hurt the US economically.
The 3 vice chairs are also questionable as 'objective' opinions.
One of these vice chairs, Yuri Izrael, was the head of the Russian agency that hid radiologicval data about Chernobyl from the public. Yeah, he's reliable.
Another, Richard Odingo once wrote an Op-Ed piece with the title:
We can't solve poverty until we stop climate change
There is no point in giving sacks of food every time drought wipes out crops - that's just not sustainable
The 3rd vice chair is the progenator of Sustainomics - Mohan Munasinghe. He is less controversial than the above IMO, but has a vested interest in being a global warming alarmist.
There is not an objective viewpoint in the upper heirarchy of this group.
And they select chairmen to lead writing each chapter who are rabid pro-global warming despite what their credentials are. More qualified people are routinely left off committees if they are not koolaid drinkers.