Depends. Climate scientists -or to use the correct nomenclature, climatologists- are largely limited by the amount available of data. I consider climatology a 'hard science,' but it hasn't been defined as a specific scientific discipline until maybe a decade ago...and is dependent on statistical analyses of observed weather patterns averaged over a 'sufficient interval.'
Meteorologists, however, are wrong a large part of the time (if not most of the time) in their forecasting; yet anyone who is concerned about the weather (pilots, sailors) doesn't stop believing in them.
From a layman's perspective, I don't see how dumping billions of tons of CO2 into the atmosphere per year while simultaneously cutting down trees and acidifying the world's oceans (70% of surface area) could have no atmospheric impact. Did you skip the chapters on metabolism, photosynthesis and basic chemistry??
While I agree that some of the more specific climate models regarding current global warming are ill-defined and that many are probably wrong, the reality is that global temperatures are increasing. Ignoring it won't make it go away.