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Reply #2: What is thought to have been a 30 year El Nino [View All]

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dipsydoodle Donating Member (1000+ posts) Send PM | Profile | Ignore Wed Jan-12-11 05:48 AM
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2. What is thought to have been a 30 year El Nino
of flooding followed by a 30 year drought may have contributed to the demise of the Mocha and Inca civilisations. Climate change appears to have been a problem c. 200 years ago too.

see here :

There are several theories as to what caused the demise of the Moche political structure. Some scholars have emphasised the role of environmental change. Studies of ice cores drilled from glaciers in the Andes reveal climatic events between 536 to 594 AD, possibly a super El Nio, that resulted in 30 years of intense rain and flooding followed by 30 years of drought, part of the aftermath of the climate changes of 535536.<4> These weather events could have disrupted the Moche way of life and shattered their faith in their religion, which had promised stable weather through sacrifices.

But more recently discovered evidence demonstrates that these events did not cause the final Moche demise. Moche polities survived beyond 650 AD in the Jequetepeque Valley and the Moche Valleys. For instance, in the Jequetepeque Valley, later settlements are characterized by fortifications and defensive works. While there is no evidence of a foreign invasion, as many scholars have suggested in the past (i.e. a Huari invasion), the defensive works suggest social unrest, possibly the result of climatic changes, as factions fought for control over increasingly scarce resources.<5>

http://en.wikipedia.org/wiki/Moche
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