50 million environmental refugees by 2020, experts say

These are people who can no longer gain a secure livelihood in their homelands because of drought, soil erosion, desertification, deforestation and other environmental problems, together with the associated problems of population pressures and profound poverty.

New Light on Polynesian Migration

The migratory story of the Polynesians may be more ancient and complicated than previously thought and may have had to do with sea level rises occurring at the time, and the formation of an archipelago.