Farmers in Brazil are more likely to invade each others’ land in years that are particularly wet or unusually dry. Americans honk their horns more at other cars when it’s hot outside. Countries in the tropics are more likely to have civil wars in years that are especially hot or dry.
They may seem random, but actually, these events are all connected. New research from Princeton University and UC Berkeley published today in Science reveals a link between big shifts in climate and precipitation and a rise in interpersonal violence, institutional breakdown, and especially inter-group violence, such as war. Not only does the paper shed light on past bouts of global conflict, it also offers a warning about the future. The world is expected to warm by at least 2 degrees Celsius over the next few decades, unless governments do something drastic, and the researchers say that increased bloodshed could be a serious side-effect of that trend.
Read more. [Image: Wikimedia Commons]