Climate, aggression, and violence (CLASH): a cultural-evolutionary approach

•As a general trend, violence increases as climates become hotter.•Climate, like other features of the physical environment, shapes cultural evolution.•Seasonal variation can shape a culture of long-term planning and self-control.•Long-term orientation and self-control are important inhibitors of violence.•Other variables (e.g., pathogens) are related to climate and violence.