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"We have 1.5 million families who don't have access to energy or who cook with firewood and coal," he said.

Faced with the hunger in the camps, some in South Sudan have tried to sell firewood.

Along with removing the eucalyptus trees, they have nurtured 50 full-grown oak trees and removed tons of old firewood and other debris, Cleaves said.

Wildlife sightings are common here, but locals also use the area for cattle-grazing and collecting fodder and firewood.

Or do they make hay while the sun is shining, and keep the firewood piled high, then brace for impact and wait for the long winter to pass?