Climate change led to collapse of ancient Indus civilization, study finds

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4. Angkor too

http://www.smh.com.au/news/travel/climate-change-ended-angkor-report/2007/03/14/1173722550238.html

Climate change ended Angkor - report

March 14, 2007

Climate change was one of the key factors in the abandonment of Cambodia's ancient city of Angkor, Australian archaeologists said today.

The centuries-old city, home to more than 700,000 people and capital of the Khmer empire from about 900AD, was mysteriously abandoned about 500 years ago.

It has long been believed the Khmers deserted the city after a Thai army ransacked it, but University of Sydney archaeologists working the site say a water crisis was the real reason it was left to crumble.

"It now appears the city was abandoned during the transition from the medieval warm period to the little ice age," Associate Professor of Archaeology Roland Fletcher said in a statement released by the university.