Penn State researchers found that city-states rose and fell in conjunction with climate change. Must have been all those SUVs the Incas drove and all the evil coal that the Aztecs burned.
The decline of Teotihuacán from 600 to 700 occurred during "some of the most volatile climate conditions evident in the Juxtlahuaca Cave climate record." This was followed by extended drought after 700 recognized by previous studies.
.......The climate became highly volatile and dry in 1000 CE when these states both went into decline. Again from 1000 to 1300 CE the climate was highly volatile, populations dispersed, and smaller competing polities are evident throughout the highlands.
HHmmnnnn, that would be about the time of the Midievel warming that Michael Mann says doesn't exist.
The decline of Teotihuacán from 600 to 700 occurred during "some of the most volatile climate conditions evident in the Juxtlahuaca Cave climate record." This was followed by extended drought after 700 recognized by previous studies.
.......The climate became highly volatile and dry in 1000 CE when these states both went into decline. Again from 1000 to 1300 CE the climate was highly volatile, populations dispersed, and smaller competing polities are evident throughout the highlands.
HHmmnnnn, that would be about the time of the Midievel warming that Michael Mann says doesn't exist.
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