We document that European regions with higher pre-industrial climatic variability display higher levels of trust today

From Climate Risk, Cooperation, and the Co-Evolution of Culture and Institutions by Johannes C Buggle and Ruben Durante.  

Over the years, I have come to regard path dependence as an under-researched but potentially significant variable in historical outcomes, particularly those related to productivity.

From the Abstract:

This paper examines the relationship between economic risk and the evolution of social cooperation. We hypothesize that trust developed in pre-industrial times as a result of experiences of cooperation aimed at coping with climatic risk. We document that European regions with higher pre-industrial climatic variability display higher levels of trust today. This effect is driven by variability in the growing season months and is more pronounced in agricultural regions. Regarding possible mechanisms, our results indicate that climatic risk favored inter-community exchange and the early adoption of inclusive political institutions which is associated with higher quality of local governments today.