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Modern historiography has not fully appreciated the ecological complexity of the Silk Roads. As a result, it has failed to understand their antiquity, or to grasp their full importance in Eurasian history. The role played by the Silk Roads in exchanging goods, technologies, and ideas between regions of agrarian civilization is well understood. Less well understood is the trans-ecological role of the Silk Roads--the fact that they also exchanged goods and ideas between the pastoralist and agrarian worlds. The second of these systems of exchange, though less well known, predated the more familiar "trans-civilizational" exchanges, and was equally integral to the functioning of the entire system. A clear awareness of this system of trans-ecological exchanges should force us to revise our understanding of the age, the significance, and the geography of the Silk Roads.
David Christian (Wed,) studied this question.