Africa's oldest national park has lost 500 acres of trees in 2 months. Here's why

Virunga National Park, a UNESCO World Heritage Site in the eastern Democratic Republic of Congo, is the latest victim of a bitter conflict between rebel militias and the Congolese military. The rebels have taken over strategic towns, forcing thousands of people to escape. Now, some of those refugees have entered the park to cut down trees to survive. CNN's Michael Holmes explains.