"Oprah" special correspondent and National Geographic host Lisa Ling will join CNN for a documentary this year that follows up on the network's "Planet in Peril."
Ling will report from countries where battles are being waged over oil, land, water and food. Also reporting for "Planet in Peril: Battle Lines" will be anchor Anderson Cooper and chief medical correspondent Dr. Sanjay Gupta. It will be televised in high definition at year's end.
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