Today,the three or four largest cities contain as many people as did the entire world some 12,000 years ago.

Name: Today,the three or four largest cities contain as many people as did the entire world some 12,000 years ago.
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Around 12,000 years ago, the global population was approximately 1 to 10 million people, a number that is comparable to the combined populations of the world's current three or four largest cities.

Today,the Three or Four Largest Cities Contain as Many People