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Researchers predict violent response to global warming (2:59) 

Sept. 26 - Researchers in California say climate change could spur an increase in global violence by as much as 50 percent over the next 40 years if current temperature trends continue. The UC Berkeley study links climatic shifts to historical outbreaks of violence, such as wars and riots, and says the trend is on an upward trajectory. Ben Gruber reports.

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