PERSON@1 , PERSON@2 -LRB- NUMBER@1 -RRB- `` Climate Change in Prehistory : the end of the reign of chaos '' -LRB- ORGANIZATION@1 -RRB- Human migration The MISC@1 pump has been used to date four waves of human migration from LOCATION@1 , namely : Homo erectus -LRB- ssp .

PERSON@1 , PERSON@2 -LRB- NUMBER@1 -RRB- `` Climate Change in Prehistory : the end of the reign of chaos '' -LRB- ORGANIZATION@1 -RRB- During these periods of a wet LOCATION@2 , the LOCATION@2 and LOCATION@3 become a savanna grassland and MISC@2 flora and fauna become common . The MISC@1 pump has been used to date four waves of human emigration from LOCATION@1 , namely : Homo erectus -LRB- ssp .
