Bad news: Global warming leads to more aggression

Based on those records, the authors estimate that if the average temperature in the U.S. increases by 8 degrees Fahrenheit (4.4 degrees Celsius), the country’s murder and assault rate will jump by about a hundred thousand cases a year.

A 2007 report by the Intergovernmental Panel on Climate Change projected that global surface temperatures could rise by 2 to 11.5 degrees Fahrenheit (1.1 to 6.4 degrees Celsius) by 2100 if no mitigating steps are taken.