Studiosi dell’Università di Cambridge hanno stabilito che alcune popolazioni hanno vissuto sul plateau tibetano a 3'400 metri già 3'600 anni fa in maniera permanente. Precedenti studi avevano permesso di raggiungere queste conclusioni parlando però di un periodo meno lontano.
Secondo una ricerca pubblicata sulla rivista statunitense Science, è grazie alla scoperta di orzo e grano, importato dal Medio Oriente, che questi agricoltori-pastori hanno potuto cimentarsi in metodi di agricoltura resistenti al freddo. Inizialmente si sarebbero spostati in queste zone per cacciare.
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