While scientists today are trying to determine the full effects and causes of ongoing climate change, it's not the first time the earth has experienced such changes. For example, in what is now Botswana's Kalahari Desert, a giant dry lake bed is revealing clues to ancient weather and how early man adapted."
Oxford University Professor David Thomas says Lake Makgadikgadi was a "mega-lake". "At its largest extent, a lake that was 60,000 square kilometers in area…about the same size as Lake Victoria. So, it's a pretty big lake, varying in depth, but many tens of meters deep. And a lake that clearly is the size of a small inland sea. So in windy conditions you'd have stormy conditions on it,".
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