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“Looking back on 2,500 years, there are examples where climate change impacted human history,” co-author Ulf Buntgen, a paleoclimatologist at the Swiss Federal Research Institute for Forest, Snow and Landscape, told the Science website.

Link  http://www.bbc.co.uk/news/science-environment-12186245

Hmm … It seems the Romans drove too many large SUV’s and pickup trucks. And ran too many air conditioners. Wait a second, these wonderful things did not exist in Roman times. How could the climate change then?  The human caused global climate change theory cannot explain this. Maybe it’s just BS?