Human civilizations depend on the climate. Changes in climate affect the production of food and other resources that support our populations and economies. Paul Hooper, alumnus and adjunct associate professor of anthropology at The University of New Mexico, recently published Human Social Complexity Was Significantly Lower during Climate Cooling Events of the Past 10 Millennia in Cliodynamics: The Journal of Quantitative History and Cultural Evolution. The research confirms that human civilizations thrive or decline depending on the climate around them.