Searching in an ancient rain-fed lake in northern India, paleoclimatologists using radiocarbon dating have discovered that 4,100 years ago, the summer monsoons began a rapid decline. They did not return to normal for two centuries. For an unimaginable two hundred years, the Harappan region saw hardly any rain. Around the same time in China, Egypt, and Mesopotamia, the three other earliest-known civilizations also were lost to the dry sands of history.
-Cynthia Barnett
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