A major combatant in this battle of ideas.
A high-profile skeptic who is the principal research scientist for the University of Alabama and the US Science Team Leader for the Advanced Microwave Scanning Radiometer on NASA's Aqua satellite.
Previously, he served as the Senior Scientist for Climate Studies at NASA's Marshall Space Flight Center. He is, also, the recipient of NASA's Medal for Exceptional Scientific Achievement and the American Meteorological Society's Special Award for the work he and John Christy did to create the UAH satellite-based temperature record.
Why he is a skeptic
He believes that most of the current warming might be due to natural, chaotic variations in low cloud cover. In the following video he explains his position.
1. Click here to read his top reasons for why he is a skeptic.
2. He has an interesting blog (if you like satellite data), click here to check it out.
3. But what do his critics say? Click here to find out what the proponent Raymond Pierrehumbert of Real Climate thinks of his work.
4. He also believes that global warming itself might be causing the CO2 increases. Click here to read the argument.