There are very eminent older climate scientists, like Richard Lindzen and Roger Pielke Sr. that are publicly critical of the green doctrine. These are scientists who are so accomplished and established as to be immune to retaliation. Mid-career climate scientists, like Roy Spencer and John Christy, both from the University of Alabama Huntsville, are critical of global warming doctrine and have done very important scientific work trying to point the science in a sounder direction. But most of the critics of global warming alarmism come from related fields of science, for example meteorology, engineering or physics.