Sometimes the obsession for control of the climate got a bit out of hand, as in the Aztec [society] where the local scientific/religious establishment of the year 1500 had long since announced that the debate was over and at least 20,000 human sacrifices a year were needed to keep the sun moving, the rain falling; and thus stop climate change. The widespread dissatisfaction of the [neighboring tribes] who were unfortunate enough to be the source of these sacrifices played an important part in the success of the Spanish conquest of Mexico.
http://www.webcommentary.com/php/ShowArticle.php?id=averyd&date=090421
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