I always amused by people with no scientific background that are positive enough that humans are having zero effect on the climate to active laugh at and slate people who think otherwise. Course, there's really nothing to gain for anybody saying it's true if it is, but lots and lots to gain for the people saying (or funding) those who claim it's false. I don't know why any government.
We might be, might not be, I don't have remotely enough understanding of the topic to hold any other view, and neither do 99.999% of people. The one positive though, is that all the climate change panic has encouraged a far more ecological attitude from a huge number of people and legislation pushed towards greener behaviour by governments, and that can only be a good thing.