«Current global
warming theory dictates that CO2 has been a major driver of climate change throughout the 20th century (Ref, ref, ref, ref, ref).
The conclusion is that, since there was
warming, and since
theory dictates that the hot spot should have been present, either the basic
theory is wrong (unlikely) or (more likely) that either the surface temperatures or the mid-troposphere temperatures are being incorrectly measured.