Barley cultivation in Jiuzhaigou National Park hasn't changed much in nearly 2,000 years. The park is located in the Min Shan mountain range, Northern Sichuan in South Western China. Credit: Washington State University

Claim: Climate change ‘may’ be responsible for the abrupt collapse of Tibetan civilization around 2000BC

From Washington State University: Closing the Case on an Ancient Archeological Mystery Solving 4,000-year-old mystery helps WSU archeologist find useful resource for a warmer future PULLMAN, Wash.–Climate change may be responsible for the abrupt collapse of civilization on the fringes of the Tibetan Plateau around 2000 B.C. WSU archaeologist Jade D’Alpoim Guedes and an international…

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

Claim: Did volcanic induced climate change wipe out Neanderthals 40,000 years ago?

From the Geological Society of America: Boulder, Colo., USA – 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.…