Nature World News: A look back at the last 12,000 years of human history reveals even small spikes in temperature and precipitation can yield major surges in violence and social upheaval -- a troubling discovery when the world is projected to warm by an average of 2 degrees Celsius (3.6 degrees Fahrenheit) by 2050.
The study, published in the journal Science, was led by researchers from Princeton University and The University of California, Berkeley, who analyzed 60 studies from a number of disciplines exploring...