text: You may want to check the scientific literature before you disparage Doppelt. 
  
  "Hot temperatures increase aggression by directly increasing feelings of hostility and indirectly increasing aggressive thoughts. Results show that global warming trends may well increase violent-crime rates." While no one can say that event A was caused by temperature B, the statistical correlation is very strong.
  
  http://cdp.sagepub.com/content/10/1/33.abstract