Roger Pielke, Sr. is a climate science who is more of an alarmist than a skeptic. But he has the rare quality of being an honest alarmist. I disagree with some of his faith in the value of peer-reviewed research without transparency and replication, and I disagree with some of his conclusions about the seriousness of some threats that he sees. He recognizes, however, the shoddiness that underlies much of the alarmist thinking. He writes a basic summary of his thoughts on climate in this post.
Worth a read.