Origins of cannabis traced back 28 million years to the Tibetan Plateau

A research team led by the University of Vermont has reviewed more than 150 existing fossil pollen studies in an effort to better understand the human-related history and evolution of cannabis in Asia. The experts traced the origin of cannabis back 28 million years to a region that sits 10,700 feet above sea level on the the Tibetan Plateau. The distribution of the pollen indicates that cannabis likely emerged near the Qinghai Lake. This region is only a few hundred kilometers northwest of the Baishiya Karst Cave, …