National Geographic host Lisa Ling will join CNN for a documentary 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 televized at year’s end.

The documentary will focus on the conflict over the ownership of the North Pole; food shortages and disease in Cameroon and the Democratic Republic of the Congo; and Indonesian shark fishing.

The first Planet in Peril aired in October and visited 13 countries to see the environmental impact of overpopulation, deforestation, species loss and climate change.