"Some of the earliest civilizations are known from the Indus (Harappan) and Yellow River (Qijia and Longshan) valleys, developing along with those in Mesopotamia and Egypt. These cultures collapsed around 4200 y BP at a time of rapid monsoon weakening, owing to direct negative impact on regional agriculture and more indirectly through changes in the river systems."
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quoted from Danino, M. (2020). Climate, Environment, and the Harappan Civilization. R. Chakrabarti, Critical Themes in Environmental History of India, 333-377.
https://en.wikiquote.org/wiki/4.2-kiloyear_event
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