 First identified by scientists just 20 years ago, the largest piece of rainforest in southern Africa is becoming a conservation area. Mabu Forest in northern Mozambique is perched on top of a mountain and surrounded on all sides by lowland. The decision to protect it came after researchers discovered dozens of new species living in the forest. It's part of a global biodiversity commitment that almost all countries have made to protect 30% of the world's land and sea by 2030.