Stretched along the north of the Hindu Kush mountain range and the south of the Oxus river, the history of the ancient region of Bactria envelops some of the most intriguing periods of the ancient world. The land, which now straddles parts of Afghanistan, Uzbekistan and Tajikistan, can be tracked through the Bronze Ages, the Persian Empire and the rule of Alexander the Great, Greco-Bactrian rule and the rule of the Kushites. To guide us through this history, Tristan spoke to David Adams, Australian photo journalist and documentary film maker. David has personally explored many of the archaeological sites of Bactria, he shares his experiences and explains how the evidence shows the impact of climate change on the societies who lived there.