The Toba catastrophe theory was controversial from its first proposal in the 1990s and by the 2010s had very little support .
The Toba catastrophe theory postulates a population bottleneck for H. sapiens about 70,000 years ago .
The Toba catastrophe theory , which postulates a population bottleneck for H. sapiens about 70,000 years ago , was controversial from its first proposal in the 1990s and by the 2010s had very little support .