Roy Spencer, a principal research scientist for University of Alabama in Huntsville questions validity of global warming claims:
Our knowledge in this area of precipitation and cloud microphysics … is so meager, that I would argue that it is a matter of faith to believe that the Earth will respond by amplifying the warming tendency. If the response is simply benign, then about 2 deg. F warming is about all we’ll have to contend with in the next 100 years or so. But in the meantime, I wish all those global warming extremists would simply confess their faith — and stop giving science a bad name.