Did a volcanic cataclysm 40,000 years ago trigger the final demise of the Neanderthals?

The Campanian Ignimbrite (CI) eruption in Italy 40,000 years ago was one of the largest volcanic cataclysms in Europe and injected a significant amount of sulfur-dioxide (SO2) into the stratosphere. Scientists have long debated whether this eruption contributed to the final extinction of the Neanderthals. This new study by Benjamin A. Black and colleagues tests this hypothesis with a sophisticated climate model. 

Figure 4 in B.A. Black et al.: This image shows annually averaged temperature  anomalies in excess of 3°C for the first year after the Campanian Ignimbrite (CI)  eruption compared with spatial distribution of hominin sites with radiocarbon ages  close to that of the eruption [Credit: B.A. Black et al. and the journal Geology] 

Black and colleagues write that the CI eruption approximately coincided with the final decline of Neanderthals as well as with dramatic territorial and cultural advances among anatomically modern humans. Because of this, the roles of climate, hominin competition, and volcanic sulfur cooling and acid deposition have been vigorously debated as causes of Neanderthal extinction.

Read the rest of this article...