Similar to the Pan Galactic Gargle Blaster, global warming is something which makes people's heads spin. Two groups of people, in fact. One group of people believe that global warming is the theory that humans are making their planet hotter by such activities as burning the fossilized remains of their ancestors. Another group believes that theory is a fabrication created by the first group in order to justify unpatriotic activities - such as burning less of their common fossilized ancestors.
Each group can not believe how the other group believes what they do.