No one here is doubting global warming's existence. The debate lies on whether the cause is anthropogenic or if it is another cause or both. Grouping global warming deniers with those skeptical of an anthropogenic cause is disingenuous.
The crux of the matter is largely the latter where there is a matter of doubt in the way society is grappling and managing it. The reason why is simple, global warming is being used largely for political and financial motivations by forcing the narrative that it is 100 percent anthropogenic.
The vast majority of climate scientists are certain that global warming is occurring, but there is a lot of uncertainty in the cause of it. A good amount of scientists believe it is anthropogenic, while there is also a good amount that believe it is non-anthropogenic or both or they are simply uncertain.