No denying it is not silly. It isn't because it hasn't been proven and the claims made by the climate scientists, as you said, might be exaggerated. When the cause of global cooling and global warming are blamed on the same, the use of fossil fuels, the credibility of the claims are very questionable.
Denying it without any scientific basis seems like it just might be silly...
For the record, what do you think is going on, and what evidence do you have for your belief?
You never change things by fighting the existing reality. To change something, build a new model that makes the old model obsolete. R. Buckminster Fuller