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. Learn more http://earth.columbia.edu/videos/watch/108 Written and Narrated by Kevin Krajick Produced by Arif Noori (http://www.twitter.com/anoori)+ More details
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