The authors…
„Behavioral and Brain Sciences” — lead-authored by Paul A. M. Van Lange of Vrije Universiteit, Amsterdam
…argue that climate — in the form of the culture it gives rise to — is the primary driver of aggression. Basically, the authors say that living in a place with greater seasonality and lower temperatures prompts people to be more future-oriented and more greatly value self-control, which the researchers call the “slow life” strategy, as opposed to the “fast life” strategy associated with hotter, less seasonal places, many of which are clustered around the equator. “Climate is one of the broad and ubiquitous variables that is likely to be a powerful cause of culture (how groups organize, the norms they share, and how individuals think and behave),” Van Lange wrote to Science of Us in an email.