Climate Expert Warns California Drought May Last Decades08:33
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President Obama is heading to Fresno, California, tomorrow, in the midst of the state's historic drought and a political fight over how to handle it.

Berkeley professor B. Lynn Ingram says the drought may be the most severe since the 1500s, based on research on tree rings. She says we may be entering a drier period that may last decades.

Ingram, who is also author of the 2013 book "The West without Water," joins Here & Now's Jeremy Hobson to discuss the drought.

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This segment aired on February 13, 2014.

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