From a brilliant post at Real Science, comparing the advanced religion of the Aztecs with that of our modern Warmies:
Like the Aztecs, many climate scientists believe that sacrificial offerings are necessary to stabilize the climate. But there are some key differences.
1. Aztecs correctly believed that the climate was controlled by the moods of the Sun. Modern climate scientists have not progressed that far yet.
2. Aztec priests believed that only a small percentage of the population needed to be sacrificed, whereas the modern priests believe that everyone (except for themselves) needs to sacrifice.