I've found this last night already. Thought this is just an interesting topic...
http://www.huffingtonpost.com/2013/0...n_3692023.html
Interesting findings, which with a little thought to it, make a lot of sense to me..Shifts in climate change are strongly linked to human violence around the world, according to a comprehensive new study released Thursday by the University of California, Berkeley and Princeton University.
The research, which was published in Science, examined 60 previous studies from all major regions of the globe. The results suggest that changes such as drought, flood and high temperatures strongly correlate with spikes in conflict.
One can notice it even on the smaller end of things. When it's pretty hot outside, people are affected, and their patience is not what it could be, they getting annoyed faster, and aggression is more noticeable than on cooler days.