The rainy Asian monsoon season waters crops for nearly half the world's population--but it may not be as reliable as we think. Scientists at Columbia University's Lamont-Doherty Earth Observatory are reading the growth rings of ancient trees to understand the history and workings of the monsoon. What they are seeing sheds light on past civilizations--and possibly on the future.

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Written and Narrated by Kevin Krajick
Produced by Arif Noori (

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