Quickly, you gather a group of anthropologist together to form a  team that can identify which tribe of native people is in danger of extinction. The team narrows it down to four cultures after studying indigenous people around the world who are located in the tundra, desert, rain forest and savanna. Their way of life is being threatened by the encroaching modern civilization of the countries they inhabit. 

Your team needs to determine the indigenous people who are most likely to become extinct so that the world can be made aware of their plight.