Ironically, though they annoyed me at the time, I never doubted that human activity is affecting the climate. In fact I would be surprised if we had little or no effect.
Why? Man pales in comparison to natural weather changes caused by the SUN, volcanoes, El Nino, etc.
I remember first reading about the carbon dioxide green-house effect as a teenager in the early 1970s - it came up often in SF stories set on Venus. I presume the authors were using the theories of 19th century scientist Svante Arrhenius as the scientific foundation. In those fictions, Venus was often depicted as a verdant hothouse.
The undisputable science of that time said we were in for an ICE AGE well before our current time period.
So unless someone can reasonably show they have some expertise on the subject I tend to not pay much attention to claims they make on forums like this one.
Well, I may not be a climate scientist, but I do know unfettered politics when I see it. The Man Made Climate Change movement is PURE POLITICS. It isn't science based except for the fact that data has been falsified, and computer models skewed to get the results the politicians want. And yes, the politicians OWN THE CLIMATE SCIENTISTS.